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CONTENTS 



Page 



Fusarium-Blight (Scab) of Wheat and Other Cereals. Dimitr 



Atanasoff I 



Cause of Lime-Induced Chlorosis and Availability of Iron in the 



Soil. P. L. Gile and J. 0. Carrero 33 



An Experimental Study of Echinacea Therapy. James F. 



Couch and Leigh T. Giltner 63 



Investigations of the Germicidal Value of Some of the Chlorin 



Disinfectants. F. W. Tilley 85 



A New Avocado Weevil from the Canal Zone. H. F. Dietz and 



H. S. Barber 111 



Studies in Mustard Seeds and Substitutes: I. Chinese Colza 



(Brassica campestris chinoleifera Viehoever). Arno ViE- 



hoever, Joseph F. Clevenger, and Clare Own Ewing .... 117 

 Study of Some Poultry Feed Mixtures with Reference to Their 



Potential Acidity and Their Potential Alkalinity. B. F. 



Kaupp and J. E. IvEy 141 



The Influence of Cold in Stimulating the Growth of Plants. 



Frederick V. Coville 151 



Composition of Normal and Mottled Citrus Leaves. W. P. 



Kelley and A. B. Cummins 161 



Control of Fluke Diseases by Destruction of the Intermediate 



Host. Asa C. Chandler 193 



Injury to Seed Wheat Resulting from Drying after Disinfection 



with Formaldehyde. Annie May Hurd 209 



Studies on the Life History and Habits of the Beet Leafhopper. 



C. F. Stahl 245 



Hypertrophied Lenticels on the Roots of Conifers and Then- 

 Relation to Moisture and Aeration. Glenn G. Hahn, Carl 



Hartley, and Arthur S. Rhoads 253 



Degree of Temperature to Which Soils Can Be Cooled without 



Freezing. George Bouyoucos 267 



Changes Taking Place in the Tempering of Wheat. E. L. Tague . 271 

 Vascular Discoloration of Irish Potato Tubers. H. A. Edson.. 277 

 Crownwart of Alfalfa Caused by Urophlyctis alfalfae. Fred 



N Ruel Jones and Charles Drechsler 295 



- Pathological Anatomy of Potato Blackleg. Ernst F. Art- 

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