Vol. XXXI 
SEPTEMBER 15, 1925 
A 
No. 6 
JOURNAL OP 
AGRICULTURAL 
CONTENTS 
Page 
Plate Counts of Soil Microorganisms ------- - 501 
N. R. SMITH and S. WORDEN 
Cladosporium Leaf Mold of Tomato: Fruit Invasion and Seed Transmission - - 519 
MAX W. GARDNER 
Fluctuation in the Distribution of the Colorado Potato Beetle' - - - - - 541 
C. H. BATCHELDER 
The Ammonia Content of Soil, and Its Relation to Total Nitrogen, Nitrates, and 
Soil Reaction - - - - - - - - - - - - 549 
HORACE J. HARPER 
Localization of the Response in Plants to Relative Length of Day and Night - - 555 
W. W. GARNER and H. A. ALLARD 
Behavior of Phytophaga destructor Say Under Conditions Imposed by Emergence 
Cages - .- 567 
WALTER H. LARRIMER 
The Reaction of Certain Grasses to Chinch-Bug Attack - • - - - 575 
WM. P. HAYES and C. O. JOHNSTON 
Difference in Intemode Lengths Between, and Effect of Variations in Light Duration 
Upon, Seedlings of Annual and Biennial White Sweet Clover - - - - 585 
A. J. PIETERS 
PUBLISHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE 
WITH THE COOPERATION OF THE ASSOCIATION 
OF LAND-GRANT COLLEGES 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1925 
