Vol. XXVIII MAY 17, 1924 No. 7 
JOURNAL OF 
AGRICULTURAL 
RESEARCH 
CONTENTS 
Page 
Studies Relating to the Immunology of Bovine Infectious Abortion - 607 
J. M. BUCK and G. T. CREECH 
The Rhizoctonia Brown Rot and Other Fruit Rots of Strawberries - 643 
B. O. DODGE and NEIL E. STEVENS 
Effective Use of Hydrocyanic-Acid Gas in the Protection of Chick-Peas (Cicer arieti- 
num) Warehoused in 240-Pound Sacks - -- -- -- - 649 
E. A. BACK and R. T. COTTON 
A New Nematode, Cylindropharynx ornata, from the Zebra, with Keys to Related 
Nematode Parasites of the Equidae - - - - - - - 661 
ELOISE B. CRAM 
Chromosomes in Maize and Maize Relatives ------- - 673 
ALBERT E. LONGLEY 
A Fusarium Bulb Rot of Onion and the Relation of Environment to Its Development - 683 
J. C. WALKER and E. C. TIMS 
The Chlorid Content of the Leaf Tissue Fluids of Egyptian and Upland Cotton - - 695 
J. ARTHUR HARRIS, JOHN V. LAWRENCE, and ZONJA WALLEN LAWRENCE 
The Resistance of Oat Varieties to Stem Rust ------- 70S 
WILLIAM W. MACKIE and RUTH F. ALLEN 
PUBLISHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE 
WITH THE COOPERATION OF THE ASSOCIATION 
OF LAND-GRANT COLLEGES 
WASHINGTON, D. C. 
GOVERNMENT PRINTING OFFICE 
