CONTENTS 
jrago 
Longevity of the Teliospores and Accompanying Uredospores of Cronartium ribicola 
Fischer in 1923 - - - - - - - - - - - 901 
PBRLEY SPAULDING and ANNIE RATHBUN-GRAVATT 
The Critical Temperature for Infection of the Potato Seed Piece by Fusarium 
oxysporum ----- - - - - - - - - 917 
H. G. MacMILLAN and G. A. MECKSTROTH 
Some Possible Errors in the Use of Curves - - - - - - - - 923 
DONALD BRUCE 
A Preliminary Study of the Growth of Noble Fir - - - - - - - 929 
E. J. HANZLIK 
The Genetics of Sex in Hemp - - - \ . - - - - - 933 
- HUGH C. McPHEE 
Effects of Feeding Animals with Trichinous Meat Containing Nonviable Trichinae - 945 
BENJAMIN SCHWARTZ 
Limitation of Student’s Method When Applied to Fertilizer Experiments - - 949 
w. w. WEIR 
Crown-gall Studies of Resistant Stocks for Prunus - - - - - 957 
CLAYTON O. SMITH 
Growth-Equation Constants in Crop Studies - - - - - - 973 
W. L. GAINES and W. B. NEVENS 
Net-Energy Values of Alfalfa Hay and Alfalfa Meal- - - - - - - 987 
E. B. FORBES, J. AUGUST FRIES, and W. W. BRAMAN l 
The Value of Litmus, Brom-Cresol Purple, and Janus-Green Milk in a Study of the 
Nodule Organisms of Leguminosae - - - - - - - - - 997 
h w. STEVENS 
PUBLISHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE 
WITH THE COOPERATION OF THE ASSOCIATION 
OF LAND-GRANT COLLEGES 
WASHINGTON, D. C. 
GOVERNMENT PRINTING OFFICE 
1926 
