A YEAST GERM. 



and if the yeast cells be kept under the field of the 

 microscope for some hours at the proper tempera- 

 ture, and then examined again, the little projections 

 already adverted to will be found to have increased 

 in size, and some will have detached themselves from 

 the parent yeast cells. Thus the minute bodies (germs) 

 suspended in the fluid portion of the yeast have 

 arisen from yeast cells which existed before them. 

 The little eminences or projections are, in fact, buds 

 or germs formed by the yeast cell, and when de- 

 tached, constitute new yeast plants, and thenceforth 

 become independent organisms. Each germ or bud 

 was for some time connected with the parent cell, 

 from which it originated. The very material of 

 which it consists was continuous with that of the 

 parent. The matter of which it was formed, in fact, 

 formed a part of the parent mass, as is well seen in 

 Figs. 7 and 8, plate I., page 16. Once detached, how- 

 ever, each little germ becomes an independent living 

 thing, and never joins again the particle from which 

 it emanated. Many of these germs detached are 

 represented in Figs. 7 and 8. The free germ may 

 multiply while it remains in the germ stage of exist- 

 ence, or it may grow into the likeness of its parent if 

 supplied with the proper nutrient material and placed 

 under conditions favourable for its advance to a higher 

 stage of its development. 



Of a single yeast particle and of its Bioplasm and 

 formed Material. It a single yeast cell be carefully 



