35 ANIMALCULA OF INFUSIONS. I, 



fities of heat ; let us next narrate what happened 

 to plants, and their feeds, in a fimilar fituation. 



The feeds I ufed v/ere grey peafe, lentils, 

 wheat, lintfeed, and trefoil : each, as ufual, was 

 expofedto a different degree, 167°, 178°, 189'^, 

 •201°, 212°, and then fown in a fmall diftindt 

 fpace of earth, fo prepared that each fpace might 

 contain an equal number of feeds. 



Their germination was not injured by 167° : 

 178*^ began to be prejudicial ; very few fucceed- 

 ed : at 189^, there were no more than eleven 

 plants of trefoil, and only ten at 201° : of thofq 

 expofed to 212°, only three germinated. Thus 

 none of the feeds but trefoil could fuilain thq 

 heat of boiling water. 



The five feeds had been fubjefted to heat by 

 means of a fand-bed. In a fecond experiment, 

 they were kept in w'ater that was gradually heat- 

 ed, till as hot as required, in the fame manner 

 as before with feeds and eggs. Heat operated 

 more powerfully on them here: at 167^, peafe 

 and trefoil germiiiated plentifully ; but very little 

 lintfeed, lentils, or wheat : at 189°, were only 

 feven ftalks of trefoil ; and at 212° none. 



My curiofity being fatisfied with regard to 

 feeds, I had ftill to fatisfy it concerning the plants 

 fprung from them. Growing plants, thirteen days 

 old, were fubjecled to 167^^, 178°, 189^, 201°, 

 ii 12°, dipping the roots in water gradually warm- 

 ed, 



