Vol. XXIX 
NOVEMBER 1, 1924 
No. & 
JOURNAL OF 
AGRICULTURAL 
RESEARCH 
It---- 
CONTENTS 
Page 
Alternaria Leaf spot and Erownrot of Cauliflower - - - - - - - 421 
j. L. WEIMER 
The Dustfall of February 13, 1923 . 443 
ALEXANDER N. V/INCHELL and ERIC R. MILLER 
Preparasitic Stages in the Life History of the Cattle Hookworm (Bustomum 
phlebotomum) - 451 
BENJAMIN SCHWARTZ 
A Mycorrhizal Fungus in the Roots of Legumes and Some Other Plants - - 459 
FRED REUEL JONES 
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 
