ol. XXIII 
MARCH 24, 1823 
No. 12 
JOURNAL OP 
AGRICULTURAL 
CONTENTS 
Summer Irrigation of Pima Cotton 
R. D. MARTIN and H. F. LOOMIS 
(Contribution from Bureau o! Plant Industry) 
Permanence of Variety in the Potato - 
FRED A. KRANTZ 
(Contribution from Minnesota Agricultural Experiment Station) 
Anatomical Studies on Potato-Wart - . 
ERNST F. ARTSCHWAGER 
(Contribution from Bureau of Plant Industry) 
Influence of Temperature and Evaporation upon the Develop¬ 
ment of Aphis pomi DeGeer - 
FRANK H. LATHROP 
(Contribution from Oregon Agricultural Experiment Station) 
Downy Mildew on Lettuce in California - - - _ _ 959 
D. G. MILBRATH 
(Contribution from Bureau ol Plant Indnstr?) - 
Determination of Starch Content in the Presence of Interfering 
Polysaccharide - - - _ _ _ 995 
GEORGE P. WALTON and MAYNE R. COE 
(Contribution from Bureau of Chemistry) - 
Biological Notes on the Hen Flea, Echidnophaga gallinac ea - 1007 
D. C.PARMAN 
(Contribution from Bureau of Entomology) 
Page 
927 
947 
963 
969 
PUBLISHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE 
WITH THE COOPERATION OF THE ASSOCIATION 
OF LAND-GRANT COLLEGES 
WASHINGTON, D. C. . 
GOVERNMENT PRINTING OFFICE 
