Vol. XXXI 
No. 3 
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AUGUST 1, 1929 
JOURNAL OS* 
f* 
AGRICULTURAL 
RESEARCH 
CONTENTS 
Par* 
Vitamin A in Beef, Pork, and Lamb - -- -- -- -- - 201 
RALPH HOAGLAND and GEORGE G. SNIDER 
The Relationship Between the Weight of Eggs and the Weight of Chicks According 
to Sex - - - - - • - - - - - - - - 223 
M. A. JULL and J. P. QUINN 
Tests of Deep-Well Turbine Pumps - - • - - - - - - 227 
F.L.BIXBT 
Colloidal Silica and the Efficiency of Phosphates - - - - - - - 247 
P. L. GILE and J. G. SMITH 
Best Time for Sowing Silver Fir in the Nursery ------- - 261 
J. V, HOFMANN 
Girdling as a Means of Removing Undesirable Tree Species in the Western White 
Pine Type - - - - - - - - - - . - - 267 
DONALD R. BREWSTER and JULIUS A. LARSEN 
Comparative Susceptibility of Onion Varieties and of Species of Allium to Urocystis 
cepulae - - - - - - - - - - - - - 275 
P. J, ANDERSON 
The Nitrogen Constituents of Celery Plants in Health and Disease - - - • 287 
G. H. COONS and L. J. KLOT2 
PUBLISHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE 
WITH THE COOPERATION OF THE ASSOCIATION 
OF LAND-GRANT COLLEGES 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
. 1925 
