128 



CLASSIFICATION OF THE MICRO-ORGANISMS. 



form by rounding off of the borders. Certain threads 

 give off lateral branches almost at right angles ; where 

 the growth is luxuriant, certain of the lateral branches 

 become large refracting globes, which are cut off, ai:d 

 are again capable of growth. The mycelium of the 



Fig. 17. Favus and Tinea fungus. (After Grawitz.) 



A. gf rminating tube cultivated in gelatine solution. 



11, breaking up of a germinating tube into sirgle conidia (in con- 

 centrated solution). 



C, formation of fruit ; formation of buds ; b, formation of gemmae. 



/>, tinea fungus ; mj'celial threads with fructification. 



E, conidia of Oidium lactis (in dilute acid nutrient solution, from 

 which thin germinating tubes are growing out) X 350. 



tinea fungus, &c., is very delicate in comparison with 

 the much thicker conidia of the Oidium lactis growing 

 on milk ; but on alteration of the nutrient substratum 

 Grawitz was able to obtain great varieties in this respect, 

 ^o that, for example, a large conidia sent out a much 



