TBE M0NAD8. 



13 



germs. It has been found 

 that while a fully growa mon- 

 ad, called Dallingeria, maybe 

 destroyed at a temperature of 

 143" F., the germs or young, 

 which are inconceivably mi- 

 nute,requiringtobe magnified 

 3000 diameters in order to be 

 seen, perish only when heated 

 in fluid to from 313° P. to 

 268° P. It would thus appear 

 that no living beings, either 

 plant or animal, are excep- 

 tions to the universal law that 

 all arise from germs. Hence 

 the doctrine of spontaneous 

 generation, which imj)lies 

 that the lower animals may at 

 the present day develop spon- 

 taneously by chcmico-physical 

 action, is not true. 



Some monads are phospho- 

 rescent. Such is the gigantic 

 monad called Nodiluca (Pig. 

 9), which occurs in great num- 



Fio. 9.—Noctiluca miliaris. diameter J4 

 to 1""™, and its germs or zoospores. 5, 

 style i n, nucleus. Greatly magoifled. 



Fig. 10. — Paramecium, caudatum, A 

 view from the dorsal side, ma£^tfled 

 340 diameters. H, the head ; T, the 

 tail; m, the mouth; m to g, the 

 throat; a, the posterior opening of 

 the digestive cavity; ci''. the anterior 

 and cv posterior contractile vesi- 

 cles; I, II, III, the radiating canals 

 of cv^ ; n, the reproductive organs; 

 V, the large vibrating cilia at the 

 edge of the vestibule. 



