45° 



SPECIFIC MICRO-ORGANISMS 



by Pasteur in 1866-1870, and largely eradicated by application 

 of the methods devised by him as a result of his investigations. 

 The spore of N. bombycis is 1.5 to 2/1 wide by 3m long. If treated 

 with nitric acid it swells and reaches a length of 6/1 and extends 

 a slender thread which may be lo/i long. The spore is ingested 



Fig. 214. — Gregarina blattarum. /, Two individuals stuck together. 77, Cysts 

 with conjugated cells and developing spores. Ill A, Unripe spore with undivided 

 contents. IIIB, Ripe spore with eight sjorozoits; ek, ectoplasm; en, endoplasm; 

 CM, cuticula; pm, prototnerit; dm, deuteromerit; «, nucleus; pn, spores; rk, residual 

 body; sk, sporozoits. (From Doflein after R. Hertwig.) 



by the silkworm and in its intestine the ameboid parasite escapes 

 and penetrates the epithelium. It may pass to any part of 

 the host to undergo its further development. Multiplication 

 of the small rounded agamete results in the formation of long 

 chains of oval bodies inside a cell of the host. From these the 



