Bacterium. 87 



cocci ; the cocci can grow again into threads. The cocci 

 are about -5 jj. in diameter, mostly in pairs or fours, or in 

 chains; the rods and threads r'25 ju. in diameter. (Fig. 75.) 

 Producing the lactic acid fermentation in boiled milk. 

 Resembles Bacillus subtilis, (?) identical. This is interesting, 

 as being one of the earliest observations of pleomorphism 

 in the Schizomycetes. 



99. B. foetidum, Thin {Froc. Roy. Soc, xxx., 1880, 

 p. 473, pi. 6). 



Occurred as Micrococci, singly or in pairs, i "25-1 -4 /i 

 in diameter. On cultivating them, with proper precautions, 

 he found also short and long rods, 

 and leptothrix threads, and all the '^co 

 stages of transition between these Xs 

 and the Micrococci. In the rods, Ti^. if'.-Bacterium /c^udum, 



X 900 after Thin). 



oval spores about i "5 /* long were 



formed, one at each extremity of a cell, as in Bacillus. 



(Fig. 76.) 



In the alkaline serous exudation from the soles of the 

 feet of a person who suffered from profuse sweating of 

 the feet, producing a fcetid odour, also observable in the 

 cultivations, in which, however, it became gradually weaker. 



100. B. decalvans, Thin {Proc. Roy. Soc, xxxiii. p. 



247, Pl- 3)- 

 Occurred as minute bodies, highly refractive, of a 

 definite size and fixed shape, about i'6 /* o 



long, usually in pairs. They became more °o^g „ 

 numerous as the hairs became worse affected w 



by the disease. (Fig. 77.) _ _ ^1:^:^^, 



In and on the roots of the hairs in x 600 (after 

 Alopecia areata. Dr. Thin supposes that they '^'"°^' 

 penetrate downwards between the root-sheath and the hair, 



