1919] CONTENTS. XVII 



SCIENTIFIC CONTRIBUTIONS. 1 



Page. 



Ainslie, C. N., A Note on the Economic Importance of Sam in cecrqpia 754 



Ainslie, G. G., Contributions to a Knowledge of the Crambins of North 



America, I 1GS 



Ainslie, G. G., Color Variation in Pupa? of Tcrias nicippe 263 



Aldrich, J. M., Seasonal and Climatic Variation in Cerodonta 169 



Aldrich, J. M., Two New Hydrotseas 263 



Aldrich, J. M.. The Kelp Flies of North America (Genus Fucellia, Family 



Anthomyldse) 263 



Aldrich, J. M., New and Little-known Canadian Oscinidre 263 



Aldrich, J. M., The Anthomyid Genus Pegonomyia 357 



Allard, H. A., Abnormalities in Nicotians 226 



Allard, II. A., Some Studies in Blossom Color Inheritance in Tobacco, 



with Special Reference to Nicotiana sylvestris and N. tabacum 442 



Andrews, C. E., Para Cymene. — I, Nitration, Mononitrocymene 710 



Armsby, H. P., and J. A. Fries, Net Energy Values of Alfalfa Hay and 



Starch 365 



Artschwager, E. F., Histological Studies on Potato Leaf Roll 543 



Ayers, S. H., and P. Rupp, A Synthetic Medium for the Direct Enumera- 

 tion of Organisms of the Colon-a?rogenes Group 3S1 



Back, E. A., Clytus devastator, a New Pest of the Florida Orange 169 



Bailey, H. S., and J. M. Johnson, The Determination of the Hexabromid 

 and Iodin Numbers of Salmon Oil as a Means of Identifying the Species 



of Canned Salmon 205 



Bailey, V., Wild Animals [of the Yellowstone National Park] 350 



Baker, A. C, The Dimorphs of Species of Chaitophorus 165 



Baker, A. C, Our Birch Symydobius Distinct from the European 262 



Baker, A. C, The Identity of Aphis circesandis 754 



Barber, H. S., Notes and Descriptions of Some Orchid Weevils 055 



Bassett, C. E., The Extent and Possibilities of Cooperation 4S9 



Beattie, W. R., Extension Work in Horticulture S33 



Benson, O. H., Junior Farmers' Institute Work 505 



Benson, O. H., and G. H. Betts, Agriculture. — Southern Edition 897 



Biggar, H. H., Primitive Methods of Maize Seed Preparation 137 



Bishopp, F. C, The Distribution of the Nose Fly and Other Species of 



Gastrophilus in the United States 458 



Boyce, J. S., Perennial Mycelium of Gymnosporangium blasdalecmum 345 



Boyce, J. S., Advance Rot and Latent Defects in Aeroplane Timber 349 



Boyce, J. S., Imbedding and Staining of Diseased Wood 843 



Brand, C. J.. The Effective Use of the Panama Canal in the Distribution 



of Products 489 



Brand, C. J., The Distribution of Agricultural Products and the Func- 

 tion of Produce Exchanges 791 



Brewster, J. F., and C. L. Alsberg, Determination of the Distribution of 



Nitrogen in Certain Seeds 502 



Brooks, C, J. S. Cooley, and D. F. Fisher, Apple Scald 849 



Burke, H. E., Oryssus is Parasitic 656 



Carpenter, C. W., A New Disease of the Irish Potato 644 



Carsner, E., Angular Leaf Spot of Cucumber: Dissemination, Overwinter- 

 ing and Control 250 



1 rrinted in scientific and technical publications outside the Department. 

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