THE STRUCTURE OF BACTERIA. 49 



of proteid substances, we approach the question 

 as we have just seen, from another side and 

 here also bacteriological researches have been 

 of fundamental importance. Indirectly these 

 results perhaps support the theoretical postu- 

 late of spontaneous generation since they seem 

 to efface still further the boundaries between 

 animal and plant, the organic and the in- 

 organic. 



4 



