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Articles 5221 - 5250 of 5255
Full-Text Articles in Entire DC Network
Chromosome Numbers In Ten Species Of Quercus, With Some Remarks On The Contributions Of Cytology To Taxonomy, Ray C. Friesner
Chromosome Numbers In Ten Species Of Quercus, With Some Remarks On The Contributions Of Cytology To Taxonomy, Ray C. Friesner
Butler University Botanical Studies
It is becoming increasingly more apparent that for the solution of many of the difficult problems in the field of taxonomy, we must take into consideration the work of the cytologist. A very large number of what we may call cytological-taxonomic studies have appeared during the past decade. These have thrown much light upon such taxonomic problems as the origin, evolution , and relationship of a species within polymorphic genera; the determination of the limits of subgenera and of variable species with numerous supposed variations, and the probable relationship of supposed natural hybrids.
Certain Aspects Of The H-Ion Concentration Of The Soils Of A Central Indiana River Bluff, Stanley A. Cain, Ray C. Friesner
Certain Aspects Of The H-Ion Concentration Of The Soils Of A Central Indiana River Bluff, Stanley A. Cain, Ray C. Friesner
Butler University Botanical Studies
In a recent paper, Cain and Friesner (3) found that there was a relation between topography and the hydrogen-ion concentration of the soil. This work was done on certain hills in the Sycamore creek region, Morgan county, Indiana, where it was found that the acidity was greater on the hilltops and less in the intervening ravines, so that curves representing the degree of acidity of the soil at different points on a line crossing the hills were roughly parallel with the topography. The average acidity on three ridge tops was pH 5.3, while the adjacent ravine bottoms were practically neutral, …
An Ecological Study Of The Heath Balds Of The Great Smoky Mountains, Stanley A. Cain
An Ecological Study Of The Heath Balds Of The Great Smoky Mountains, Stanley A. Cain
Butler University Botanical Studies
The inhabitants of the Great Smoky mountains usually refer to the heath communities under consideration as "slicks" or "balds." The former name is derived from the smooth appearance they present on the ridges and mountain tops when viewed from a distance and which is entirely misleading, for they are extremely rough and tangled. The name "bald" refers to the absence of trees, these areas being exclusively occupied by shrubs. The term "heath bald" is used in this paper to include all such treeless areas dominated by members of the order Ericales. The use of the term "heath" is not entirely …
Living Material In The Laboratory, O. R. Clark
Living Material In The Laboratory, O. R. Clark
Science Bulletin
Living plants and animals serve as valuable aids in stimulating interest in the biology course and, during that part of the year when field trips are impossible, provide material for the study of habits and the relation of organisms to their environment. Laboratory conditions are of course artificial but they should be made as nearly natural as it is possible to make them.
Insects And Man, Roy L. Abbott
Insects And Man, Roy L. Abbott
Science Bulletin
Biologically speaking, insects may be called a highly successful group, and much of this success is due to their adaptability to the conditions of their environment. They are found everywhere, and eat almost everything. All of the large groups of insects are world-wide in their distribution, though the most widely distributed are the beetles.
Insects And Man, Roy L. Abbott
Insects And Man, Roy L. Abbott
Science Bulletin
Mrs. Jiggs, in the cartoon, "Bringing up Father," frequently calls her husband an insect. This is a flagrant misuse of the term as an insect never has fewer nor more than six legs. It may be wingless as are the bedbugs, two winged as are all flies, or four winged as the grasshoppers, but no normal insect ever has more or less than six legs and by this one positive character you may know them.
Collecting Specimens At Night, Roy L. Abbott
Collecting Specimens At Night, Roy L. Abbott
Science Bulletin
Many teachers of biology don’t realize how much valuable biological material may be collected after dark. In fact, certain specimens, as grasshoppers, earthworms, and various species of amphibia, are most easily captured then.
Introducing The Biology Course In The Classroom, Roy L. Abbott
Introducing The Biology Course In The Classroom, Roy L. Abbott
Science Bulletin
The success of any course in high school science often depends upon the interest aroused in it during the first days of its presentation. This interest is particularly easy to arouse in biology, chiefly, l suppose, because people are always interested in living things, or things that have been alive. Moreover, though he does not recognize it as such, nearly every pupil has considerable biological knowledge when he first comes to class, and it is this preliminary knowledge which can be made a strong entering wedge into his interest in the subject.
Cockroaches For Laboratory Study, Roy L. Abbott
Cockroaches For Laboratory Study, Roy L. Abbott
Science Bulletin
Teachers of high school biology are often handicapped by a lack of living material. This is particularly true in the teaching of insects. Most texts in biology use the grasshopper as a type of insect, largely, I suppose, because of its familiarity to the average pupil.
Key To Genera Of Ferns And Fern Allies, Ray C. Friesner
Key To Genera Of Ferns And Fern Allies, Ray C. Friesner
Butler University Botanical Studies
The keys to be found in the Manuals used for taxonomic study often require the student using them to have a greater knowledge of the species under than is obtainable from the specimen at hand. For example, the indusium regularly drops from the sorus in some genera when the fronds are young, while in other genera, indusia are never present. Examples of these are found, in the case of the former condition, in Cystopteris and Woodia, and in the case of the latter condition, in Polypodium and Phegopteris. How is the student just beginning taxonomic work on the ferns to …
The Genus Trillium In Indiana, Ray C. Friesner
The Genus Trillium In Indiana, Ray C. Friesner
Butler University Botanical Studies
The fact that members of the genus Trillium are quite variable is well borne out when one notes the number of reports of variations and teratological conditions in the literature. Such conditions make it important that more detailed critical study be made of members of the genus from the standpoint of their distribution and variation in smaller areas. Studies of the species occurring in wider areas were made by Gleason (19) and Gates (18). More detailed study of particular species in more restricted areas is of considerable value in adding light to the problem of species relationship and delimitation. Such …
Index V.1, 1929, Ray C. Friesner
Index V.1, 1929, Ray C. Friesner
Butler University Botanical Studies
Information about the publication, as well as a table of contents.
Some Ecological Factors In Secondary Succession: Upland Hardwood. Ii. Soil Reaction And Plant Distribution In The Sycamore Creek Region, Stanley A. Cain, Ray C. Friesner
Some Ecological Factors In Secondary Succession: Upland Hardwood. Ii. Soil Reaction And Plant Distribution In The Sycamore Creek Region, Stanley A. Cain, Ray C. Friesner
Butler University Botanical Studies
An examination of the vegetation of the Sycamore creek region would certainly warrant the assumption that soils of many of the ridge tops are decidedly acid, for there are a number of plant communities made up of notoriously acid-tolerant species. Conspicuous members of these communities are Vaccinium vacillans, V. stamineum, Gaylussacia baccata, Populus grandidentata, and various mosses, as Polytrichum juniperinum, Catherinea angustata, Leucobryum, Dicranum, etc. Since these communities are exclusively on the tops and upper slopes of the characteristically narrow ridges, it was thought desirable to investigate the extent of the hydrogen-ion concentration of these soils and to ascertain any …
Life-Forms And Biological Spectra Of The Flora Of Bacon's Swamp, Indiana, Alice Phillips
Life-Forms And Biological Spectra Of The Flora Of Bacon's Swamp, Indiana, Alice Phillips
Butler University Botanical Studies
During the nineteenth and the first part of the twentieth century no detailed statistical studies of vegetation in relation to climate had been devised. The work relating to the two was broad, general and superficial. Climatic formations of the world had been described and classified by plant geographers and early ecologists, as Schimper, Warming, Cowles and others. Work was done classifying regions as xerophytic, mesophytic or hydrophytic, but no methods had been published giving means of ascertaining in more detail the degree of xerophytism, mesophytism or hydrophytism. In 1909, C. Raunkiaer, of Copenhagen, Denmark, published a paper on "Life-Forms and …
The Relation Of Certain Ecological Factors To The Inhibition Of Forest Floor Herbs Under Hemlock, Rexford F. Daubenmire
The Relation Of Certain Ecological Factors To The Inhibition Of Forest Floor Herbs Under Hemlock, Rexford F. Daubenmire
Butler University Botanical Studies
In the region of Turkey Run State Park, Parke county, Indiana, there occurs an abundance of Hemlock, Tsuga canadensis. In this locality the tree is to be found typically along the upper limits of precipitous creek bluffs and along the rims of the sandstone canyons,-- here it is the dominant plant in an edaphic climax. The Hemlock association is a codominant climax with the typical Beech-Maple climax of the region.
What Are We Teaching In Biology?, C. W. Lantz
What Are We Teaching In Biology?, C. W. Lantz
Science Bulletin
This subject in order to be of real value must be an actual study of plants and animals. I have observed in my teaching that pupils, when given recognition characters of trees, may be able to pass a satisfactory examination on these characters, but fail to recognize the trees they describe when they see them in the field. They have simply memorized words that mean nothing to them.
Some Suggestions For Winter Study Of Biology In High Schools, Roy L. Abbott
Some Suggestions For Winter Study Of Biology In High Schools, Roy L. Abbott
Science Bulletin
Considerable criticism has recently been directed against the commonly accepted methods of teaching Biology in our secondary school and colleges. John Burroughs once re- marked that he had never dissected an animal and was glad of it, implying by this, I take it, that we do not learn Nature by dissecting her children. Recently Wheeler of Harvard, has voiced a similar criticism by saying that our teaching of Biology is suffering from academic dry rot; that laboratory dissection of a dead animal gives the student a knowledge of the details of structure of that animal without giving any knowledge of, …
Chelonian Brain-Membranes, Brain-Bladder, Metapore And Metaplexus, John P. Munson
Chelonian Brain-Membranes, Brain-Bladder, Metapore And Metaplexus, John P. Munson
Biology Faculty Scholarship
The chelonian brain is not too small to be studied macroscopically. It is easily removed from the skull. Minute surface details and the cell structure can be easily observed.
Organization And Polarity Of Protoplasm, John P. Munson
Organization And Polarity Of Protoplasm, John P. Munson
All Faculty Scholarship for the College of the Sciences
In higher forms of life, we usually concede the presence of an organ specialized for the performance of a function. In these higher forms coordination of organs, which entails a regular sequence in their functions, is readily made out; and it seems a mere platitude to say, of these, that organization determines the functions of the organism. To what extent can functions exist in the absence of organization; does the one precede the other; or have function and organization developed simultaneously, out of matter devoid of both structure and function? In my studies on the cell, I have kept these …
Embryology And Evolution, Malo Marius Amunson
Embryology And Evolution, Malo Marius Amunson
Manuscript Thesis Collection
The proofs of evolution must be sought in the entire field of science. Direct proof is found in the study of Morphology, whose bases are comparative anatomy; embryology; in the study of paleontology, of geology, of geographical distribution, in the study of nature and experiments of today. In this vast field of direct proofs of evolution it is our purpose to present some of the evidences of evolution as furnished by one of these, namely, Comparative Embryology.
Spermatogenesis Of The Butterfly, Papilio Rutulus, John P. Munson
Spermatogenesis Of The Butterfly, Papilio Rutulus, John P. Munson
All Faculty Scholarship for the College of the Sciences
For a number of years I have been studying the spermatogenesis of Papilio rutulus (pl. 12, fig. 1) not ,with any one single problem especially in view, but with the aim of ascertaining the entire life history of its sperm cell, its various phases of development, its mode of growth and differentiation, the history of its several parts, and its relation to the organism.
The Wooster Voice (Wooster, Ohio), 1904-06-16, Wooster Voice Editors
The Wooster Voice (Wooster, Ohio), 1904-06-16, Wooster Voice Editors
The Voice: 1901-1910
"Solemn Ceremonies Close Commencement Week," is about the class of 1904 graduating from the College of Wooster. In "When Greek Meets Greek," the annual tradition of the Pan-Hellenic Banquet returns after six years. "Class Day," is about the seniors presenting he play The Private Secretary. In "Talked To Graduates," the annual baccalaureate address was given by the president. "Seniors Equip Laboratory," is about the proceeds from Class Day going to the purchase of apparatus. In "Prof. J. C. Boyd Resigns," Professor Boyd will be leaving the campus to work in business. "Struck By Lightening," is about George D. Dunham …
Letter From Eiler Freece, Eiler Freece, F. N. Shepherd, Nelson H. Trimble, Edwin R. Barrett
Letter From Eiler Freece, Eiler Freece, F. N. Shepherd, Nelson H. Trimble, Edwin R. Barrett
Applications for Staff Employments Faculty, Student and Graduate
Letter concerning qualifications for a position at the Utah Agricultural College, including references.
Letters From J. D. Mclaren And W. J. Kerr, J. D. Mclaren, William J. Kerr
Letters From J. D. Mclaren And W. J. Kerr, J. D. Mclaren, William J. Kerr
Applications for Staff Employments Faculty, Student and Graduate
Letters concerning a position at Utah Agricultural College as well as a biography detailing John Dice McLaren's qualifications.
Pamphlet For Kellogg's College Agency, Herbert S. Kellogg
Pamphlet For Kellogg's College Agency, Herbert S. Kellogg
Applications for Staff Employments Faculty, Student and Graduate
Pamphlet detailing the services provided by Kellogg's College Agency.
Letter From Sara Godwin Goodwin, Sara Godwin Goodwin
Letter From Sara Godwin Goodwin, Sara Godwin Goodwin
Reports of the Secretary to the President Student Affairs President’s Correspondence, 1900-1907
Letter concerning the library at Utah Agricultural College.
Letter From Sara Godwin Goodwin, Sara Godwin Goodwin
Letter From Sara Godwin Goodwin, Sara Godwin Goodwin
Reports of the Secretary to the President Student Affairs President’s Correspondence, 1900-1907
Letter concerning the library at Utah Agricultural College.
Letter From L. G. Carpenter, L. G. Carpenter
Letter From L. G. Carpenter, L. G. Carpenter
Applications for Staff Employments Faculty, Student and Graduate
Letter of recommendation for E. D. Ball.
Letter From E. D. Ball, E. D. Ball
Letter From E. D. Ball, E. D. Ball
Applications for Staff Employments Faculty, Student and Graduate
Letter concerning a position in biology at Utah Agricultural College.
Student Biology Notebook, Jack Thorington, Joseph S. Winter
Student Biology Notebook, Jack Thorington, Joseph S. Winter
Winter Letterbooks
Student Biology Notebook dated 1894.