36 BULLETIN 810, V. S. DEPARTMENT OF AGRICULTURE. 



(17) White, G. F. — Continued. 



1917. Sacbrood. U. S. Dept. Agr. Bui. 431. 55 p., 33 fig., 4 pi. Feb- 



ruary 9. 



(18) 



1918. Nosema-disease. U. S. Dept. Agr. Bui. 780. 59 p., 7 flg., 4 pi. 



( Professional paper. ) June 12. 



(19) 



1920. American foulbrood. U. S. Dept. Agr. Bui. 809. 46 p., 9 fig., 8 pi. 

 Marcli 10, 1920. 



(20) Zandee, Enoch. 



1910. Die Faulbrut und ihre Bekampfung. 32 p., 8 fig., 4 pi. Stutt- 

 gart. (Handbuch der Bienenkunde I.) 



