Vol, XXX 
JANUARY 15, 1925 
No. 2 
\ _ _ 
C|%4J 
» - JOURNAL OP 
AGRICULTURAL 
RESEARCH - 
CONTENTS 
Classification of the Scale Insects of the Subfamily Ortheziinae - 97 
HAROLD MORRISON 
A Test of Raw Onions in the Diet as a Control Measure for Worms in Dogs - - 155 
M. C. HALL, J. E. SHILLINGER, and E. B. CRAM 
Study of the Life History and Ecological Relations of the Smut of Maize - - - 161 
ALDEN A. POTTER and LEO E. MELCHERS 
Further Studies on the Toxicity of Juice Extracted from Succulent Onion Scales - 175 
J. C. WALKER, CARL C. LINDEGREN, and FREDA M. BACHMANN 
Borax as a Disinfectant for Citrus Fruit 189 
WILLIAM R, BARGER and LON A. HAWKINS 
The Occurrence of Copper, Manganese, Zinc, Nickel, and Cobalt in Soils, Plants, 
and Animals, and Their Possible Function as Vital Factors - - - - 193 
J. S. McHARGUE 
PUBLISHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE 
WITH THE COOPERATION OF THE ASSOCIATION 
OF LAND-GRANT COLLEGES 
WASHINGTON, D. C. 
GOVERNMENT PRINTING OFFICE 
1925 
