XXIV EXPERIMENT STATION RECORD. [Vol.41 



Page. 

 Turrentine, J. W., and. P. S. Slioaff, Potash from Kelp: The Experi- 

 mental Plant of the United States Department of Agriculture; Pre- 

 liminary Paper 508 



Van Fleet, W., New Pillar Rose 242 



A'an Fleet, W., Progress in Breeding Freesias 448 



Van Fleet, W., Fragrant Roses___ 742 



Van Fleet, W., Rose-breeding Notes for 1918 742 



Vickery, R. A., and T. S. Wilson, Observations on Wingless May Beetles- 666 

 Viereck, H. L., Additions and Corrections to a List of Families and Sub- 

 families of Ichneumon Flies of the Superfamily Ichneumonoides 



(Hymenoptera) 360 



Vinal, S. C, and D. J. Caffrey, The European Corn Borer and Its Con- 

 trol 236 



Waldrou, L. R., and J. A. Clark, Kota, a Rust-resisting Variety of Com- 

 mon Spring Wheat 535 



Ward, W. F., Feeding Beef Cattle 564 



Warner, M. F., Horticultural Libraries in the United States 343 



Watson, T. L., and E. T. Wherry, Pyrolusite from Virginia 420 



Webstei-, R. O., Observations on the Washing of Milk Cans 373 



Weir, J. R., and E. E. Hubert, Cultui'es with Melampsorse on Populus 353 



Weir, J. R., Concerning the Introduction into the United States of Extra 



Limital Wood-destroying Fungi 746 



Weir, J. R., and E. E. Hubert, Pathological Marking Rules for Idaho and 



Montana 840 



Wells, S. D., and V. P. Edwardes, Nitrating of W^oodpulp Cellulose 14 



Wheeler, W. A., Seed Reporting as a Public Service 737 



Wherry, E. T., The Statement of Acidity and Alkalinity with Special 



Reference to Soils 205 



Wherry, E. T., and E. Tanovsky, Crystallography 801 



White, G. F., Unheated Egg-yolk Media 63 



Wilcox, E. v.. Tropical Agriculture: The Climate, Soils, Cultural 

 Methods, Crops, Live Stock, Commercial Importance, and Opportunities 



of the Tropics 194 



Woglum, R. S., Recent Results in the Fumigation of Citrus Trees with 



Liquid Hydrocyanic Acid 164 



Woglum, R, S., and A. D. Borden, Comprehensive Demonstration of 



Argentine Ant Control 166 



Woglum, R. S., and M. B. Rounds, The Stratification of Liquid Hydro- 

 cyanic Acid as Related to Orchard Fumigation 754 



Wright, S., Scientific Principles Applied to Breeding 267 



Wright, S., The Average Correlation within Subgroups of a Population- 366 



Wright, S., On the Nature of Size Factors 473 



Yarnell, D. L., Segment Blocks have Advantages on Larger Size Drains 483 



York, H. II., and P. Spaulding, The Overwintering of Cronartium ribi- 



cola on Ribes 158 



Yothers, W. W., The Care of Spraying Machinery 551 



ILLUSTRATIONS. 



Page. 



Fig. 1. Modified apparatus for the wet combustion method 206 



2. Diagram of the life histories of leaf hoppers injurious to apple 



trees as observed at Geneva, N. Y 253 



