Life Sciences Commons^™

A Comparative Study Of The Structure And Origin Of The Yolk Nucleus, John P. Munson

Biology Faculty Scholarship

The question as to the comparative structure and origin of the yolk nucleus involves several other problems:

1. Is the yolk nucleus a normal element of the egg cytoplasm, or is it associated with pathological states of the egg, or is it an artefact due to reagents?

2. Is there a necessary connection between one form and another such that one can be derived from the other?

3. Is it an amorphous chemical substance or does it possess anything suggesting permanence of structure?

4. Does it arise de novo or is it a modification of something similar existing in the …

Zusätze Und Berichtigungen Zu Dr. H. Frieses: Die Bienen Afrikas. (Hym.), H. Brauns

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Notes On The Eastern Species Of Cerceris (Hym. Philanthidae), Nathan Banks

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The species of Cerceris are among the prettiest of our entomophilous wasps; usually black, with bands and spots of yellow, of the general appearance of many species of Crabro. They are most abundant on flowers in July, some occur in June, and others as late as October. They are not especially shy, so are readily taken in the net.

Annual Report Of The Director Of The South Dakota Agricultural Experiment Station For The Year Ending June 30, 1912, South Dakota State College Of Agriculture And Mechanic Arts

Agricultural Experiment Station and Research Farm Annual Reports

No abstract provided.

Citrus Notes-Agriculture, Charles C. Chapman

Charles C. Chapman Citrus Speeches

Speech presented at the Orange County Teacher's Institute. Mr. Chapman advocates for agricultural education in the primary and secondary schools. He also delves into the myriad attributes and abilities needed to be a farmer but also stresses that a farmer should be a student not only of nature but of books.

Citrus Notes-The Santa Ysabel Ranch, Charles C. Chapman

Charles C. Chapman Citrus Speeches

These are notes for an article published in by the Fullerton News.

A Consideration Of The Physiology And Life History Of A Parasitic Botrytis On Pepper And Lettuce, George L. Peltier

Department of Plant Pathology: Faculty Publications

During the autumn of 1911, while gathering the peppers (Capsicum) in the vegetable plat of the Missouri Botanical Garden, the writer observed a fungus which was appearing as a parasite on the fruits. The peduncles were covered with a dark brown mass of conidia and mycelium, which so weakened the tissues that the fruit soon fell to the ground. On opening the peppers a number of large, flat, crust-like sclerotia, 1 cm. long and .5 cm. wide, were found to fill the interior. In most cases the seeds were also covered with the crust-like masses. The conidial stage …

The Unexpected Occurrence Of Aleurone Colors In F2 Of A Cross Between Non-Colored Varieties Of Maize, R. A. Emerson

Department of Agronomy and Horticulture: Faculty Publications

Before the Mendelian methods of analysis became available, considerable wonder would doubtless have been excited by the "mysterious" appearance in F₂ of one colored grain-purple or red-to every five or six white ones in case of a maize cross, both parents and F, of which had only white grains. An occurrence of this sort has recently been noted in one of my maize cultures and the F2 numbers are explained here as a trihybrid or tetrahybrid ratio. The crosses in question were made primarily for a study of size inheritance and fairly large numbers have been grown. The varieties …

Descriptions And Records Of Bees - Xl, T. D. A. Cockerell

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Miscellaneous Notes On Collecting In Georgia, William T. Davis

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Descriptions And Records Of Bees - Xxxix, T. D. A. Cockerell

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Records Of Bees, T. D. A. Cockerell

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Some Experimental Observations Concerning The Behavior Of Various Bees In Their Visits To Cotton Blossoms, H. A. Allard

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In the past a great deal of experimental work has been carried on to determine how flowers attract insects. The conclusions reached have been various and have served to provoke lively discussions as to the relative importance of the visual sense and the olfactory sense in guiding insects to flowers.

New And Little Known Bees, T. D. A. Cockerell

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The Bees Of The Solomon Islands, T. D. A. Cockerell

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A New Psenid Wasp From Peru, T. D. A. Cockerell

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Descriptions And Records Of Bees - Xxxviii, T. D. A. Cockerell

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A List Of The Bees Of The Genus Perdita Smith, T. D. A. Cockerell

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Verbena Stricta Vent., Hugh C. Sampson

Specimens by Name

No abstract provided.

Descriptions Of New Hymenoptera No. 3, J. C. Crawford

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Most of the species described in this paper were received for determination through the Bureau of Entomology, United States Department of Agriculture, and are of economic importance. The figures made to illustrate certain details were all drawn with the aid of the camera lucida. Comparative measurements were made with an eye-piece micrometer used in the Zeiss binocular microscope.

Names Applied To Bees Of The Genus Nomada Found In North America, T. D. A. Cockerell

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Vitis Vulpina L., H. C. Sampson

Specimens by Name

No abstract provided.

Vitis Vulpina L., H. C. Sampson

Specimens by Name

No abstract provided.

Humulus Lupulus L., H. G. Sampson

Specimens by Name

No abstract provided.

Descriptions And Records Of Bees - Xxxvi, T. D. A. Cockerell

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Viola Striata Aiton, Hugh Charles Sampson

Specimens by Name

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Bees In The Collection Of The United States National Museum. 2, T. D. A. Cockerell

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Spraying As An Essential Part Of Profitable Apple Orcharding, R. A. Emerson, R. F. Howard, V. V. Westgate

University of Nebraska Historical Extension: Bulletin

It was therefore planned from the start not merely to demonstrate the possibility of controlling apple insects and diseases but also to determine whether they could be controlled profitably. To accomplish this it was necessary to know: exactly what it cost to spray, what sprayed fruit yielded, and what it was worth in comparison with unsprayed fruit from the same orchards. In every spraying demonstration the time spent in mixing and applying the materials and the quantity of material used were recorded. The cost of labor of men and teams per hour was taken at the orchard owners' estimates and …

Bees In The Collection Of The United States National Museum. 1, T. D. A. Cockerell

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The Entomologist: An Illustrated Journal Of General Entomology No. 574, Kenneth J. Morton, Rupert Stenton, T. Miyake, C. G. Nurse, W. J. Lucas, Richard South, L. W. Newman, T. D. A. Cockerell, W. J. Lucas, W. L. Distant, A. E. Wileman

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No abstract provided.