*Z2C AN'IMALCULA OF INFUSIONS. % 



veflels hermetically fealed. Here, then 5 the her- 

 metic feal was a matter of indifference. 



You remark, that the period of germination is 

 proportioned to the duration of the experiment. 

 The fhorter it is, the more immediate the germi- 

 nation : a confequence which it was eafy to fore- 

 fee. As extreme heat is unfavourable to vegeta- 

 tion, it fhould naturally be retarded in the feeds 

 longer expofed. 



You alfo faw many more plants germinate of 

 thofe in open veffels than in veffels hermetically 

 fealed. Both were indeed expofed to the fame 

 heat ; but the air in the open vefiel could be re- 

 newed. The plants there lliould on that account 

 have continued vegetating, while their vegetation 

 foon ceafed in the clofe veffels, which in fad you 

 have feen. 



IX. From all your experiments, 2 general and 

 comparative refult is deduced. ' It is not with 

 < feeds as with animalcula. The produ£lion of 



* thefe is more immediate, in proportion as the 



* heat is more intenfe : with the others it is pre- 

 « cifely the reverfe.' The vegetable organic fyf- 

 tem differs greatly from the animal. The laws 

 of the one are not thofe of the other. The prin- 

 ciple of the motion of the fluids is not the fame 

 in both : they are not nouriihed in the fame 

 manner ; nor are their origin and developement 

 fubjed to the fame reftridions. It is true, we 



difcover 



