14 THE INVISIBLE WOELD 



will proceed in the same way to result in sixty-four. 

 So on indefinitely. 



Another method of propagation is by the Pro- 

 duction of Spores. In Fig. 26 is represented a 

 spiral microbe. It has no spores. Fig. 27 repre- 

 sents the same microbe with spores formed. In 

 Fig. 28 the sac has disappeared and the spores are 

 free. Each spore will develop into a microbe ex- 

 actly like its parent. 



Fig. 29 represents a spherical microbe. It has 

 no spores. In Fig. 30 the spores are formed. In 

 Fig. 31 the sac has disappeared, leaving the spores 

 free, each to be developed into a full grown being 

 like its parent. 



In Fig. 32 is shown a rod-shaped microbe with- 

 out spores. Fig. 33 shows the same shaped mi- 

 crobe with spores formed. Fig. 34 shows the same 

 without the sac, each spore ready to grow into a 

 rod-shaped being like its parent. 



A third method of propagation is by Budding. 

 In Fig. 35 the parent microbe has put forth two 

 buds, one on either side. In Fig. 36 the buds have 

 become full grown and separated from the parent. 

 In place of one are now three. In Fig. 37 each of 

 these three has again budded. In Fig. 38 the buds 

 are all mature and separate, forming nine indi- 

 viduals. So the process may continue to any ex- 

 tent. 



Fig. 39 shows how the process of budding may 

 continue to considerable extent before separation 

 begins. 



