r x no.3cy- 
JULY 21, 1923 
CONTENTS 
No. 3 
Cage 
Seme Relations of the Crowngall Organism to Its Host Tissue - 119 
A. J. RISER 
(Contribution from Wisconsin Agricultural Experiment Station) 
Oxygen-Supplying Power of the Soil as Indicated by Color 
Changes in Alkaline Pyrogallol Solution - - - - 133 
LEE M. HUT CHINS and BTOTON E. LmKGSTON 
( Contribution from Bureau of Plant Industry) 
Bacterial Spot of Lima Bean - - - - 
Wi B. TISDALE and MAUDE MILLER WILLIAMSON 
(Contribution from Wisconsin Agricultural Experiment Station) 
141 
Hydrogen-Ion Changes Induced by Species of Rhizopus and 
by Botrytis cinerea - - - - - - - - 155 
J. L. WEIMER and L. L. HARTER 
_ (Contribution from Bureau of Plant Industry) 
PUBLISHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE 
WITH THE COOPERATION OF THE ASSOCIATION OF 
LAND-GRANT COLLEGES 
WASHINGTON, D. C. 
GOVERNMENT PRINTING office 
