vot* JLXLIV 
% 
JUNE 9 
I^~i B H A H’y - 
i 92 ^FrBivT:D 
SEP >^‘^923 ^ 
•g, g. *» 4 «p«»t»* 
No. lOt 
CONTENTS 
Former Studies on the Inheritance of “Rogue” Types in Garden 
Peas (Pisum sativum L.) - - - - - - “ 
WILBER BROTHERTON, jR. 
( Contribution from Biireatt of Plant Industry ) 
Page 
815 
A Method of Treating Maize Seed to Destroy Adherent Spores 
of Downy Mildew - - - - - - - - - 853 
WILUAM H. WESTON, Jr. 
Influence of the Substrate and its Hydrogen-Ion Concentration 
on Pectinase Production -' t - > • - 861 
L. L. HARTER and J, L. WEIMER 
( Contribution frem Bureau of Plant Industry) 
//' 
The Microscopic Estimation of Colloids in SoU Separates 
WHLIAU H. ;FRY 
I (Contribution from Bureau af Soils ) 
- 879 
POBUSHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE 
WITH THE cooPHiATiwi OF THE Association 
OF tANPrGRANT COLLIES 
WASHIRGTOH.,D. C. 
' GOVERR^MEKT PRINTING Omch 
