THALLOPHYTES 



43 



together before any other plants appeared, and that under 

 such conditions Fungi could not appear until after Algae 



FIG. 23. Bacteria of various kinds, mostly ciliated ; F is the bacterium of typhoid 

 fever, and H that of cholera. After ENOLER and PRANTL. 



had started the business of food-manufacture. However, we 

 know nothing of the history of plants before the Algae and 



