1920] CONTENTS. XXIII 



Page. 

 Sarvis, J. T., Composition and Density of the Native "Vegetation in the 



Vicinity of the Northern Great Plains Field Station 522 



Sasscer, E. R., Important Foreign Insect Pests Collected on Imported 



Nursery Stock in 1919 352 



Satterthwait, A. F., Notes on the Habits of Calendra pertinax Olivier 762 



Schroeder, E. C, A Review of Several Publications on Inf(>ctious Abortion 



Disease 784 



Schultz, E. S., and D. Folsom, Transmission of the Mosaic Disease of 



Irish Potatoes 546 



Schwartz, B., The Biological Relationships of Ascarids 380 



Shamel, A. D., Results of Five Years' Individual Tree Performance 



Records with Pruned and Unpruned Lemon Trees 239 



Shamel, A. D., The Conservation and Application of Manures 239 



Shamel, A. D., Results of Individual Tree Performance Record Studies 



with Pruned and Unpruned Marsh Grapefruit Trees 439 



Shamel, A. D., Origin of a Grapefruit Variety Having Pink-colored 



Fruits 440 



Shamel, A. D., Bud Selection Investigation with Citrus Fruits 542 



Shamel, A. D., Avocado Performance Records 837 



Shapovalov, M., Is the Common Potato Scab Controllable by a IMere Rota- 

 tion of Crops? 751 



Shapovalov, M., and H. A. Edson, Wound Cork Formation in the Potato in 



Relation to Seed Piece Decay 732 



Sheals, R. A., Report of the White Pine Blister Rust, State of Rhode 



Island, 1919, in Cooperation with the Bureau of Plant Industry, U. S. 



Department of Agriculture 658 



Shinn, E. H., Lessons in Plant Production for Southern Schools 797 



Skinner, J. J., and C. F, Noll, Field Tests on the Action of Fertilizers 



on Soil Aldehydes 519 



Skinner. J. J., and F. R. Reid, The Influence of Phosphates on the Action 



of Alpha-crotonic Acid in Plants 131 



Slocum, R. R., Methods of Pedigree Breeding at the Government Poultry 



Farm 675 



Smith, E. B., Pressure of Green Concrete against Forms 389 



Smith, F. H., Significant Trends in Lumber Production in the United 



States 44 



Snell, W. H., Observations on the Relation of Insects to the Dissemina- 

 tion of Cronartiuiri ribicola 754 



Snyder, T. E., The Colonizing Reproductive Adults of Termites 556 



Snyder, T. E.. Protecting Buildings Against the White Ant 592 



Spaulding, P., Scientific Research in 1919 [on White Pine Blister Rust]- 249 

 Spencer, G. C, Potash from Kelp.— II, The Experimental Distillation of 



Kelp at Low Temperatures 630 



Stevens, N. E., and A. H. Chivers, Fanning Strawberries in Relation to 



Keeping Quality 848 



Taylor, M. W., The Overwintering of Cronartium ribicola on Ribes 849 



Tiemann. H. D., The Phenomena of Drying Wood 590 



Tiemann, H. D., Phenomena of Drying Wood 591 



Trullinger, R. W.. The Farmer's Part in Bigger Crops 321 



Vosbury, E. D., Avocado Varieties 342 



Waggaman, W. H.. and T. B. Turley, The Production of Phosphoric Acid 



by Smelting Phosphate Rock in a Fuel-fed Furnace 629 



