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Amiotic Parthenogenesis In Taraxacum Vulgare (Lam.) Scrk. And Traxacum Laevigatum (Willd.) Dc., Paul B. Sears

Papers in Ecology

The work of which the results are here offered, awaiting detailed presentation in a paper to follow, was begun at the University of Nebraska in 1914, under the direction of the late Dr. Charles E. Bessey. The two species of dandelion which have been studied are respectively the Leontodon taraxacum and the L. erythrospermum of the Second Edition of Britton and Brown's Illustrated Flora: the nomenclature used in the title of this paper has been adopted on the basis of evidence presented in the monograph of the genus Taraxacum by Handel-Mazetti.

Arterial Anomalies Pertaining To The Aortic Arches And The Branches Arising From Them, Charles William Mccorkle Poynter

University Studies (University of Nebraska) (1888–1984)

For a number of years I have been interested in the arterial variations which have been encountered in my dissecting rooms. Notes have been made of these abnormalities and the literature describing similar conditions has been gradually collected. The more recent textbooks in anatomy devote little space to the subject of arterial variations and the classic works which have reviewed the field are no longer readily consulted; then, too, new facts have been added to our knowledge of arterial development since the most recent of the latter were published. In view of these facts it has seemed worth while to …

A Physiological Study Of Two Strains Of Fusarium In Their Causal Relation To Tuber Rot And Wilt Of Potato, George K. Link

Nebraska Agricultural Experiment Station: Historical Research Bulletins

1. Fusarium tuberivorum Wilcox and Link is the same as Fusarium trichothecioides Woll. 2. Both Fusarium oxysporum and F. trichothecioides can produce both tuber rot and wilt of the potato plant. 3. The wilt is induced by destruction of the root system and by clogging of the xylem elements in the stem, and is, in mild cases, marked by such symptoms as discoloration of leaves, curling and rolling of leaves, and production of aerial tubers. 4. Under field and storage conditions Fusarium oxysporum is more probably responsible for wilt than is F. trichothecioides, and the latter more responsible for …

Notes On Two Free-Living Larval Trematodes From North America, Henry Baldwin Ward

Harold W. Manter Laboratory of Parasitology: Library Materials

Summary

A description is given of the structure and activity of two new cercariae of peculiar type captured free in Lake Erie and Lake St. Clair. They are designated Cercaria anchoroides nov. spec. and C. gorgonocephala nov. spec., and are compared with known European species. Although such an occurrence must be common, these forms are the first to be taken in open fresh waters.

Transpiration As A Factor In Crop Production, T. A. Kiesselbach

Nebraska Agricultural Experiment Station: Historical Research Bulletins

The object of experiments reported in this bulletin has been to determine principles according to which water is used by crops. In many agricultural districts, water is frequently a seriously limiting factor in crop production. It has been thought that some means might be devised through a correct understanding of the principles involved, whereby economy in the use of water in farm practice could be increased. In this effort there are two chief points of attack, namely, (1) adjusting the external factors to the needs of the plant, and (2) selecting plants adapted to the conditions.

Ecological Investigations Upon The Germination And Early Growth Of Forest Trees, Richard H. Boerker

University Studies (University of Nebraska) (1888–1984)

Briefly stated the purpose of the present investigation is to inquire into the effect of the more important habitat and seed factors upon the germination and early development of certain American forest trees in control cultures in the greenhouse for the purpose of obtaining data that may be used in the ~ilvicultural management of these species.

Prefatory Note 1 / Preliminary Considerations 7 / Historical 7 / Classification and Resume of Habitat Factors 11 / The Germination Process 15 / Method of Attacking Problem at Hand 19/ Methods and Apparatus Used 2 1/ The Control of Habitat Factors 24 / …

On A New Subspecies Of Porcupine From Nebraska, Myron H. Swenk

University Studies (University of Nebraska) (1888–1984)

Publication NO.2 of the Nebraska State Biological Survey.

Nebraska porcupines all belong to the yellow-haired species (Erethizon epixanthum) , and these animals have never been abundant in the state. Formerly, however, they were much more numerous than today, and enjoyed a more extended range in the state than they do at the present time. Up to about 1885 these animals occurred across the northern portion of Nebraska east at least to Pierce and Madison counties, there being records of four specimens secured along the small streams tributary to the Elkhorn river in these two counties between 1870 and 1885. Also, …

Evaporation And Plant Zones In The Cedar Point Marsh, Paul B. Sears

Papers in Ecology

Yapp in trying to account for the xerophytic structure of marsh plants by means of evaporation studies has shown a definite correlation to exist between the strata of marsh vegetation and rates of evaporation at corresponding levels. The following studies were made in an attempt to discover what additional correlations, if any, exist between distribution of marsh plants and the evaporational power of the air at different portions of the habitat. While the exact quantitative significance of such work as the following may be brought into question, as it often is, the striking results obtained by Transeau, Livingston, Fuller, Weaver, …

The Prairie Dog And Its Control, Myron Harmon Swenk

University of Nebraska-Lincoln Extension: Historical Materials

Introduction
Injury
Appearance and History
The Prairie Dog Home
Habits
Natural Enemies
General Control
Use of Poisoned Baits
Competitive Experiments in Fall Poisoning
Competitive Experiments in Spring Poisoning
Demonstration Poisoning Experiments
Effect of Poisoning on Other Animals
Fumigation of Burrows
Fumigation Experiments
Less Successful Methods
Bibliography

Mallophaga From Apteryx, And Their Significance, With A Note On The Genus Rallicola, Launcelot Harrison

Harold W. Manter Laboratory of Parasitology: Library Materials

Regards the skins of five species of Apteryx in the collection at the Cambridge University Museum in England. From these were collected three species of Mallophaga belonging to the genus Rallicola. These are described with discussion about the significance of this occurrence upon Apteryx, from which no Mallophaga have previously been recorded.

Sociology And The Law, Arthur W. Spencer

Mid-West Quarterly (1913–1918)

A significant recent development in the field of legal science in this country, the importance of which is not yet generally recognized by laymen, is the noteworthy awakening of interest in the philosophical literature of the continent of Europe dealing with legal institutions. Progress in this field of legal philosophy has been especially rapid since the late seventies, particularly in Germany. In English-speaking countries no phenomena of equal significance have occurred. America has never produced any notable philosophical jurists; and the work of English legal scholars of the past generation, though in some instances it has been brilliant and of …

Natural Reforestation In The Mountains Of Northern Idaho, Harry B. Humphrey, John Ernst Weaver

Papers of John E. Weaver (1884–1956)

The factors affecting the natural reforestation of a fire-denuded area may, in general, be said to be the same in Idaho and Oregon as in Maine or Minnesota. There may be and actually are differences in detail as to what species of herbaceous and shrubby plants may prepare the way for the more delicate seedlings of those trees native to the particular locality. But the principle prevails everywhere that certain plants or plant societies. are antecedent and probably essential to the appearance and permanent establishment of a forest. The first step in the reforestation of a fire-swept area is the …

A Study Of The Root-Systems Of Prairie Plants Of Southeastern Washington, John Ernest Weaver

Papers of John E. Weaver (1884–1956)

While carrying on a study of the plant formations and associations of semi-arid southeastern Washington in 1912-1914, it soon became apparent that for a proper understanding of the development and structure of these associations a knowledge of the root-systems of the more important prairie species was imperative. Consequently, during the fall, winter, and spring of 1913--1914, more than 350 root-systems of 25 of the most important ecological species were examined. This paper contains descriptions of these, together with a discussion of the conditions under which the plants grow.

The prairies of southeastern Washington, and their eastward extension into adjacent Idaho, …

Bulletin 155, Rotations And Tillage Methods In Western Nebraska (Popular Edition), 1915

University of Nebraska Historical Extension: Bulletin

Bulletin 155, Rotations and Tillage Methods in Western Nebraska (Popular Edition), 1915

The Insect Galls Of Cedar Point And Vicinity, Paul B. Sears

Papers in Ecology

The following list is based on rather careful collections made during the summer of 1914. Since the list contains many forms common throughout Ohio, I have aimed to make the synonymy fairly complete to date, as an aid to students, while the bibliography has been limited to original description (where possible) and some more recent notice which should be helpful.

In the course of this work I have become deeply indebted to Mr. W. J. Kostir, of Ohio State University, while Prof. Herbert Osborn, Prof. B. W. Wells, Prof. Myron Swenk, Miss Edith Patch, Mr. Nathan Banks and others have …

A Revision Of The Cestode Family Proteocephalidae, George Roger La Rue

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Introduction

Several years ago while studying under Professor Henry B. Ward .at the University of Nebraska the writer began an investigation of a cestode parasitic in Amblystoma tigrinum (Green). That investigation resulted in a paper (La Rue 1909) in which a number of points in the anatomy of Proteocephalids were cleared up and certain problems were -outlined for investigation at an early date. In the meantime the writer became interested in the large number of Proteocephalids which Professor Ward had secured by work in the field and by exchange. The writer had also made some collections. A preliminary study of …

Charles Peirce At Johns Hopkins, Ellery W. Davis

Mid-West Quarterly (1913–1918)

In the company of scholars and investigators which Daniel Coit Gilman gathered at Baltimore in the seventies and eighties was Charles S. S. Peirce, son of the Harvard mathematician, Benjamin Peirce, and considered by Sylvester (surely a capable judge) “a far greater mathematician than his father.” But great though his mathematical powers were, it is not they alone which chiefly distinguished him among the scientists of his generation. Mathematics was simply one of the many fields of thought tilled by his active brain. At Harvard it was in chemistry that he had chiefly distinguished himself, but it might as well …

Summary Of Two Years' Study Of Insects In Relation To Pellagra, Allan H. Jennings

Harold W. Manter Laboratory of Parasitology: Library Materials

Excerpt:

With the growing interest in pellagra, following the authoritative recognition of its presence in the United States in 1907, the study of its etiology was taken up by various investigators and the several theories of causation were subjected to close scrutiny.

Prominent among these theories was that of insect transmission, first advanced by Sambon, who limited this function to the species of blood-sucking gnats comprising the genus Simulium.

The importance of the disease and the possibility of such a factor in its causation, led the Bureau of Entomology, late in 1911, to undertake an investigation of the subject …

Literature And The New Anti-Intellectualism, Philo M. Buck, Jr.

Mid-West Quarterly (1913–1918)

" Never has he drawn so deeply from the well that is the human heart; never so near those invisible heights which are the soul." The reviewer who wrote this sentence probably meant that the author of the book he so enthusiastically welcomed wrote with a little more than the ordinary insight. Indeed if we are to judge from the encomiums in our less critical reviews the world has never been so blessed with novels and plays which touch the secret springs of the heart. The old fiction had generalised, had conventionalised, much as the old art had done. This, …

Puero Reverentia, Philo M. Buck, Jr.

Mid-West Quarterly (1913–1918)

"The kindergarten is no longer an experiment. Critics may say what they will about its being a waste of time, an opportunity to play under unnatural conditions; they may assert that the work done by the child there is purposeless, that the child is too old when he enters; in short, they may empty every chamber of their wrath; yet the fact still stands that children who have gone through the kindergarten in the normal way are better and stronger physically, mentally, and morally when they enter the grades than those who have had no such training. This has been …

German Romanticism, P. H. Frye

Mid-West Quarterly (1913–1918)

The German romantic movement was the result of defective culture, of bodily and mental derangement, of spiritual and nervous disorder. It is a work of degeneration, deformation, and disease. And it bears on its front the stigmata of its infirmities - absurdity, folly, inanity, and confusion. There is Hardenberg, the pattern of the school, who falls in love with a chit of thirteen and at her death a year or so later dedicates himself to the grave, an unblemished sacrifice of love, unblighted by sickness, violence, or sorrow, the cheerful victim of his own regret. In the meanwhile he begins …

Literature And Criticism, P. H. Frye

Mid-West Quarterly (1913–1918)

In these days of "scientific method," when there is so little literary activity of a genuinely critical sort, it is a good deal easier to say in what such activity does not, than in what it does, consist. That literary criticism is not identical with a study of words or language, or yet of texts or "documents"; that it is not to be confounded with philology or with the exploration of origins or derivations, or the investigation of manuscripts, or a determination of the details of literary history-all this ought. to be reasonably clear on the face of it, and …

Formal Logic And Logical Form, Edwin Ray Guthrie

Mid-West Quarterly (1913–1918)

Last year Dr. F. C. S. Schiller published Formal Logic, a Scientific and Social Problem, - a critical text-book, he calls it in the preface, that will teach logic" in a critical spirit and with a minimum of pedantry and reverence for forms." This object is so thoroughly fulfilled - at the end of the four hundred pages the criticism has been so searching and insistent and the reverence for forms so truly a minimum that formal logic seems to be a complete ruin, and the only scientific problem left at the end is how men ever came to …

The Inheritance Of A Recurring Somatic Variation In Variegated Ears Of Maize, R. A. Emerson

Department of Agronomy and Horticulture: Faculty Publications

The inheritance of variegation has special interest and importance in genetics. It is with forms of variegation that the only two certainly known cases of non-Mendelian inheritance have had to do. I refer to Baur's experiments with Pelargonium, in which crosses of green-leaved and white-leaved forms exhibited somatic segregations in F₁ that bred true in later generations, and to Correns 's work with Mirabilis, which showed green and white leaf color, to be inherited through the mother only. De Vries's con- ception of "ever-sporting" varieties was apparently founded largely upon the behavior of variegated flowers in pedigree …

Multiple Factors Vs. "Golden Mean" In Size Inheritance, R. A. Emerson

Department of Agronomy and Horticulture: Faculty Publications

Groth's preliminary note on the "golden mean" in the inheritance of sizes in SCIENCE of April 17, 1914, pp. 581-584, deserves the attention of geneticists. Its publication is of such recent date that I need only call attention to one or two points that seem to me of particular moment.

In brief, Groth's hypothesis is that the mode

of inheritance in F_l not only of surfaces and

volumes, but also of linear dimensions is to be

expressed by √ab rather than by a + b /2

where a and b are parent sizes. The hypothesis

is based upon …

A Notable Botanical Career, Charles E. Bessey

School of Biological Sciences: Faculty Publications

I have before me the " Report of the Botanist" to the Regents of the University of the State of New York, bearing date of January 1, 1868, covering less than two pages, and signed by Charles H. Peck. There is internal evidence that his services began July 1, 1867, the writer reporting what he had accomplished in the half year since that date. A year later the " Report of the Botanist " covered about 80 pages and included a short general statement followed by (A) List of Species of Which Specimens Have Been Mounted; (B) Plants Collected; (C) …

Synopsis Of The Conjugate Algae-Zygophyceae, Charles E. Bessey

School of Biological Sciences: Faculty Publications

A dozen or more years ago the writer prepared a series of papers on these plants, which were published in volumes 21, 22 and 23 of these Transactions, and now it seems that time enough has elapsed to warrant another paper dealing with the same group, and including such revisions as are now made necessary because of our better knowledge of their structure, and the structure of the nearly related plants.

Contributions To A Science Of Nematology, Nathan Augustus Cobb

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Contents

I. Antarctic Marine Free-Living Nematodes of the Shackleton Expedition.

II. North American Free-Living Fresh-Water Nematodes.

III. The Asymmetry of the Nematode Bunonema inequale, n. sp.

IV. Selachinema, a New Nematode Genus with Remarkable Mandibles.

V. Notes on Nemas.

VI. The Mononchs, a Genus of Free-Living Predatory Nematodes.

VII. Filter-Bed Nemas: Nematodes of the Slow Sand Filter-Beds of American Cities.

VIII. The Orders and Classes of Nemas.

IX. One Hundred New Nemas (Type Species of 100 New Genera).

X. Howardula benigna, a Nemic Parasite Cucumber-Beetle.

XI. Marionella.

XII. Greeffiella.

XIII. An Amendation of Hoplolaimus …

Rocky Mountain Flowers, Frederic E. Clements, Edith Schwartz Clements

School of Biological Sciences: Faculty Publications

AN ILLUSTRATED GUIDE FOR PLANT-LOVERS AND PLANT-USERS WITH TWENTY-FIVE PLATES IN COLOR AND TWENTY-TWO PLATES IN BLACK AND WHITE

The present book is an endeavor to present the materials of the Rocky Mountain flora in preliminary form from the standpoint of the experimental ecologist. The latter is concerned primarily with the relationships of "species" and their subdivisions as an organic expression or measure of habitat differences, and of the competitive relations of the various formations. Whatever the taxonomic value of the numerous segregates of the last decade or two, the fact that the binomial form conceals the relationship to the …

The Literary Interregnum, Louise Pound

Mid-West Quarterly (1913–1918)

In a Phi Beta Kappa address given last year before certain university audiences of the middle west, the head of the Columbia School of Journalism, Dr. Talcott Williams, made something of a text of the dearth of contemporary literary activity of the highest order. His reference was chiefl y to poetry, but he seemed to feel that there is now relative sterility nearly everywhere in the literary field. Th e period seemed to him not perhaps so much an interregnum, for that holds promise of succession to vacant thrones, as a period of decline; and this decline he felt to …