EXPERIMENTS ON SPONTANEOUS GENERATION, ETC. 12? 
II. He has farther shown that they are propagated by 
demonstrable germs only , in snch infusions ; and 
III. This fact removes the probability of their spontaneous, 
generation to an almost infinite distance. 
As to the development of bacteria in infusions charged with 
solid matter, precise experiment of a sufficiently comprehensive- 
character has yet to be made on them, in relation to the demon- 
strated germs. Meantime, shall we accept “ spontaneous gene- 
ration ” on such ground as its strongest advocate has now to 
offer, and ignore the vast chain of facts copiously attested and 
controlled, which are in perfect harmony with the known laws 
of the entire organic world ? This, and nothing less than this*, 
is what Dr. Bastian inculcates and demands. 
EXPLANATION OF PLATE CXXXIII. 
Fig. 1. Spore-sac of the cercomonad — the first in the series of Messrs* 
Dallinger and Drysdale’s 11 Researches ” — emitting spore. 
Figs. 2 , 3, 4, 5, and 6. The same states of the five other monads of the 
series. 
Fig. 7. A monad found by Dr. Bastian in an infusion, after heating up 
to 275° F., said to be spontaneously generated. 
Fig. 8. The same monad as seen by Dallinger and Drysdale, and the 
spore of which (fig. 4) survives 300° F. 
