No. 6 
S J 
o o *>X MARCH 15, 1925 
JOURNAL OP 
AGRICULTURAL 
RESEARCH ~ 
— - ; [4||S s * 
CONTENTS 
Page 
Infection and Dissemination Experiments with Degeneration Diseases of Potatoes. 
Observations in 1923 - - - - - - - - - - - - 493 
E. S. SCHULTZ and DONALD FOLSOM 
Studies of Spore Dissemination of Venturis inaequalis (Cke.) Wint. in Relation to 
Seasonal Development of Apple Scab - - - - - “ “ “ ” ^9 
C. N. FREY and G. W. KEITT 
Relation Between Mortality of Trees Attacked by the Spruce Budworm (Caecoecia 
fumiferana Clem.) and Previous Growth - - - - - - - - 541 
F. C. CRAIGHEAD 
Review of the Nematode Genera Syngamus Sieb. and Cyathostoma E. Blanch. - 557 
EDWARD A. CHAPIN 
Cooperia bisonis, a New Nematode from the Buffalo - - - - - “ 571 
ELOISE B. CRAM 
Some Physical and Chemical Properties of Xanthophyll and the Preparation of the 
Pure Pigment -. - - - - - - - 575 
F. M. SCHERTZ 
Physiological Studies on Cereals. III._The Occurrence of Polypeptides and Amino ^ 
Acids in the Ungerminated Maize Kernel - - - - - - “ 587 
S.L.JODIDI 
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 
