-3- 
Gerstung, Ferdinand. Das problem des bienenzuchtbetriebes in fruhtracht 
gegenden. 32 p., illus. Berlin, Fritz Pfenningstorff, 1920. 
Hewitt, C. G. The conservation of the wild life of Canada. 343 p.-, 
illus., 23 plates. N. Y., Charles Scrioner's Sons, 19el. 
Kawamira, R., and Yamaguchi, M. Ueber die Tsutsuganusti-krvankheit in 
Formosa, zugkeich eine vergleichende studie derselben mit der in 
Nordjapan. Kitasato Archives of Experimental Medicine, v. ye nos 3 
p. 169-206, plates. October, 19el. Litersturverzeichnis, p. 204-206. 
Kohl, E. J. Mallonhaga of our native birds. Proc. Indiana Acad. 
Sci. ame 1920, p. 119-133, illus. Fort Wayne, Ind., 1921. Bibliography, 
p. 100. 
Lee, A. B. The microtomist's vade-mecum, a handbook of the motheds 
of microscopic anatomy... Sth ed., 504 p. Philadelphia, P. Blakiston's 
son & Co., 19el. 
Lindsey, A. W. The Hesperioidea of America north of Mexico. 114 p., 
illus.; pl. (University of Iowa Studies. tudies in natural history, 
vy. 9, no. 4) Iowa City, Published by the University, Yebruary 15, 1921. 
Bibliography, p. 111-114. 
Muttkowski, R. A. Copper, its occurrence and role in insects and other 
animals. Trans. 4mer. Micros. Soc., Vv. UO, no. 3, p. LH4-157, 1921. . 
Bibliography, p. 157. 
Peryassu, Antonio G. Os Anophelineos do Brazil. Archivos do Mugeu nacional 
© Ao Rio de Janeiro, v. 23, p- (5)-101, illus., table, pl. 4O. 1921. 
Swain, A. F. A synepsis of the Aphididae of California... 221 Pee 
plates. (Univ. of Calif. pubs. Tech. Bul. Gol. Agr. Agr. Expt. Sta. 
Entomology, v. 3, no. 1) Berkeley, Univ. of Calif. Press, Nov. 1, 1919. 
Wickson, E. J. he California fruits and how to grow them. Ed. 9, 
greatly revised. 508 p., jllus., plates. San Francisco, Pacific Rural 
Press, 1921. Fruit protection, P.- 46g-4e6. 
Wollman, E. Le role des mouches dans le transport des germs patho- 
genes etudie par la methode des elevages aseptiques. Annales de 
l'Institut Pasteur, v. 35, no. 7, P- 431-449, 1921. 
