142 



THE BEGINNINGS OF II FE. 



colourless or coloured \ They may be almost naked 

 masses of protoplasm, or they may present a bounding 

 membrane of various degrees of thickness. They may 

 be nucleoJated or non-nucleolated ; provided with vacu- 

 oles or devoid of vacuoles; so that oftentimes they 

 exist as mere minute spherical or elongated vesicles, 



Fig. 48. 

 Forms illustrating interchangeability of TorulcE and Bacteria. ( X 1670.) 



a Minute Toriilce growing in jelly after the fashion of Bacteria, from 



hay infusion. 

 h. Bacteria with Tortila-Yik& forms, from beef infusion. 



c. Homogeneous Bacteria, more or less like Torulce in form. 



d. Fungus-spores developing in a homogeneous film — many of them in 



their early stages having the shape of Bacteria — from the surface of 

 an old hay infusion. 



composed of a minutely-granular protoplasm slightly 

 condensed at the surface. In this condition no dif- 



^ Either brown or green. All transitions may be seen from the 

 colourless condition to the brown tint which is so frequently assumed by 

 fungus-spores (p. 233), and similarly all transitions may be seen from the 

 colourless to the green tint (vol. i. pp. 364, 450). The new-born specks 

 of matter which become green tend, however, to develop into Algae 

 rather than Fungi. 



