5f2 PHILOSOPHICAL TRANSACTIONS. [aNN0]701. 



among so many thousands as I have taken out of the testicles of a ram, I never 

 found any that broke to pieces, though several of their bodies, after the exha- 

 lation of the moisture, might be observed flat, &c. I have tried several times 

 to take off the uppermost skin of some of the animalcula of a ram, which I 

 had kept five months together upon glass before my miscroscope, with a very 

 fine pencil dipped in water, in hopes of making further discoveries, but could 

 not succeed. 



In January I took a live cod-fish, and finding that its seed came from it very 

 thin, with a little pressing, I took a drop of it, in which I discovered a vast 

 number of animalcula. I repeated the observation the same evening with the 

 same success ; but next day I could find none of them alive ; and whereas I had 

 laid that drop upon a small copper plate, I fancied the exhalation of the mois- 

 ture might be the cause of their death, and not the cold weather, which at that 

 time was very moderate. 



In the beginning of April I took the male seed of a jack or pike, but could 

 discover nothing more than in that of a cod-fish ; but having added about four 

 times as much water in quantity as the matter itself was, and then making my 

 remarks, I could perceive that the animalcula not only waxed stronger and 

 swifter, but, to my great amazement, I saw them move with that celerity a 

 river fish does when chased by its enemy, just ready to devour it. You must 

 observe that this whole course was not longer than the diameter of a single head 

 hair. 



j4 Scale of the Degrees of Heat. N° 270, p. 824. Translatedfrom the Lalin. 



O . . O . . The heat of the air in winter, when the water begins to freeze ; 

 and it is discovered exactly by placing the thermometer in com- 

 pressed snow, when it begins to thaw. 

 , The heat of the air in winter. 

 O . . The same in spring and autumn. 

 Tiie same in summer. 



Heat of the air at noon about the month of July. 

 Greatest heat the thermometer received on the contact of a 

 man's body, as also that of a bird hatching her eggs. 

 14^»_. . 1^. . Almost the greatest heat of a bath, which a man can bear by 

 moving his hand in it for some time ; also that of blood newly 

 drawn. 

 17 .. \),. . Greatest degree of heat of a bath, which a man can bear for 

 some time without stirring his hand in it. 



