420 
Journal of Agricultural Research 
Vol. VIII, No. ii 
(17) White;, G. F. 
1907. The cause of American foul brood. U. S. Dept. Agr. Bur. Ent. Circ. 
94. 4 p. 
(18) - 
1912. The cause of European foul brood. U. S. Dept. Agr. Bur. Ent. Circ. 
157* I5P-, 
(19) - 
1913. Sacbrood. U. S. Dept. Agr. Bur. Ent. Circ. 169. 5 p. 
PLATE 93 
A. —Bacillus mesentericus: Growth of a 24-hour-old surface colony on an agar plate. 
X 140. 
B. —Bacillus vulgatus: Growth of a 24-hour-old surface colony on an agar plate. 
X 140. 
t 
