Vol. XXI 
AUGUST 1 , 1921 
\ V ^ , CONTENTS ■ ^ 
Studi is the Physiology of' Parasitism with Speoiall 
■Reference to the Secretion of Pectinase by Rhizopus 
- tritici - • V ■ 
• -. • L. L. HARTER aad j. L. WEIMER 
(Contribution from Bureau ol Plant Industry) 
Respiration and Carbohydrate Changes Produced in Sweet 
Potatoes by Rhizopus tritici - - - 
J. L. WEIMER and L. L. HARTER 
< Contribution from Bureau of Plant Industry ) - 
Wound-Cork Formation in the Sweet Potato - - - 
J, L. WEIMER and Li L. HARTER 
(Contribution from Bureau of Plant Industry) 
Two Sclerotium Diseases of Rice - - - - 
W. H. TISDALE \ 
(Contribution from Bureau of Plant Industry) 
A Biological Study of the Red Date-Palm Scale, Phpeni- 
cococcus marlatti - - - - - - - 
ARTHUR D* BORDEN 
- . • , • (Contribution from Bureau of Entomology) \ 
Red Date-Palm Scale, Phoenicococcus marlatti: A Techni¬ 
cal Description ----- - 
HAROLD MORRISON 
(Contribution from Bureau of Entomology ) ^ 
Some Observations Regarding Eosinophiles - - - 
LEWIS H. WRIGHT 
(Contribution from Nevada Agricultural Experiment Station) 
A Souring of Beef Caused by Bacillus megatherium - 
HUBERT BUNYEA 
-\ ■ (Contribution from Bureau of Animal Industry) 
PUBLISHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE* 
WITH THE COOPERATION OF THE ASSOCIATION OF 
LAND-GRANT COLLEGES 
WASHINGTON, £>. C. 
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