168 Journal of Agricultural Research voi. xxvm, no. 2 



(42) Steel, M. 



1910. an improvement op the polin method for the determination 



OP TjRiNART AMMONIA NITROGEN. Jour. Biol. Chem. 8: 365-379. 



(43) Straus, J. 



1911. DIE CHEMI8CHE ZUSAMMENSETZTTNG DEE ARBEITSBIENEN UND 



DROHNEN WAHREND IHRER VERSCHIEDENBN ENTWICKLUNGSSTA- 



DiEN. Ztschr. Biol. 56: 347-397, illus. 



(44) Sturges, W. S., and Tettqer, L. F. 



1922. bacterial atjtoltsis. Jour Bact. 7: 551-577, illus. 



(45) Sturtevant, A. P. 



1920. A STUDY OF the BEHAVIOR OP BEES IN COLONIES APPBCTBD BY 



EUROPEAN pouLBROOD. U. S. Dept. AgT. Bul. 804, 28 p., illus. 



(46) 



1922. BROOD DISEASE VARIATIONS. EXPLANATION POR SOME OP THE CON- 



FUSING SYMPTOMS IN THE GROSS DIAGNOSIS OP BEE DISEASES. 



Gleanings Bee Cult. 50: 298-302, illus. 



(47) 



1923. LES MALADIES DU COUVAIN D'aBEILLES TELLES QU'oN LES CONNAIT 



Aux etats-unis. Cong. Internat. d'Apioulture Marseille (1922) 

 6: 168-177. 



(48) Vedder, E. B. 



1915. STARCH AGAR, A USEFUL CULTURE MEDIUM. Jour. Infect. Diseases 

 16: 385-388. 



(49) White, G. F. 



1904. the further investigation op the diseases affecting the 

 APIARIES IN THE STATE OP NEW YORK. N. Y. State Dept. Agr. 

 Ann. Rpt. Com. (1903) 11: 103-114. 

 (50) 



(51) 



(52) 



1906. THE BACTERIA OP THE APIARY, WITH SPECIAL REFERENCE TO BEE 



DISEASES. U. S. Dept. Agr., Bur. Ent. Tech. Ser. 14, 50 p. 



1907. THE CAUSE OP AMERICAN FOUL BROOD. U. S. Dept. AgT., Bur. 



Ent. Circ. 94, 4 p. 



1912. THE CAUSE OP EUROPEAN POULBROOD. TJ. S. Dept. Agr., Bur. 

 Ent. Circ. 157, 15 p., illus. 



1917. SACBROOD. U. S. Dept. Agr. Bul. 431, 54 p., illus. 



1919. UNHEATED EGG YOLK MEDIA. Science 49: 362. 



1920. AMERICAN POULBROOD. U. S. Dept. Agr. Bul. 809, 46 p., illus. 



(53) - 



(54) - 



(55) - 



(56) - 



1920. EUROPEAN POULBROOD. U. S. Dept. Agr. Bul. 810, 39 p., illus. 



(57) Zander, E. 



1921. handbuch der bienbnkundb in EINZELDARSTELLUNGEN. IV. 



DAS lbben dbr bibne. Aufl. 2, 195 p., illus. Stuttgart. 



O 



