THE BIOLOGY OF MICROBES, ETC. 153 



Here the bacilli arrange themselves apparently side 

 by side, and producing spores in this position, we 

 have as a result, after a few days' cultivation, long 

 rows of spores lying side by side, with here and 

 there an adult bacillus. 



In uiilk they grow well at the body temperature, 

 and in a few days cause coagulation of the milk ; 

 and on potatoes they form a dryish yellow layer. 

 These bacilli also grow in blood serum and in 

 bouillon. 



FIG. 37. BACILLUS ALVEI. 

 (Cheshire and Cheyne.) 



A, Passage of spore into bacillus condition. 



B, Passage of bacillus into spore condition. 



B. alvei does not grow below 16 C. ; but it grows 

 most rapidly in cultivating media kept at the 

 body temperature. Cheshire and Cheyne sprayed 

 a cultivation of the bacillus in milk over a honey- 

 comb containing a healthy brood of larval bees, and 

 succeeded in reproducing the disease known as 

 ' foul-brood.' They also succeeded in infecting adult 



