VOL. XXVII.] PHILOSOPHICAL TRANSACTIONS. Q4\ 



could not discover any of the least particles to be like those aaimalcula above- 

 mentioned. From which observation I thought with myself, that as foetuses lie 

 in the uterus, in such a globular form, as is consistent with our bodies ; so in 

 like manner, these globules, which I saw, were animalcula proceeding from the 

 semen masculinum, that were not yet arrived to their perfect shapes. 



Eight days after, I got two other testes of a young ram, which were smaller 

 than the former; which having opened in the like manner, as I did the other, 

 I found not only no animalcula that appeared to be living, but the transparent 

 globules were not the 4th part so large as the above-mentioned. 



Upon the 13th of July, I again caused the two testes of a sucking ram to be 

 brought me; which was about 14 or 15 weeks old, and its testes were little 

 more than half as large as the first. Having opened these likewise, in that part 

 where the vasa semen deferentia were thickest, and taken one of them out, and 

 viewed it with the microscope, I judged that those globules which I observed in 

 it were so small, that 25 of them were not equal to one of the large ones above- 

 mentioned. 



July the 18th, I made an experiment of the same nature with the former, 

 the lamb being almost as old as the preceding; but I could not discover any 

 globules larger than the last mentioned, nor any thing that appeared to be 

 living. 



July the 'ZOth, I repeated my experiment on the testes of a young ram, 

 which was very near as large as the first of all; which having opened in the 

 usual place, I saw great numbers of living animalcula : I discovered likewise in 

 the fluid matter, which I had taken out, several globules floating, which I 

 imagined likewise might be some of those imperfect animalcula above- 

 mentioned. All these young rams were killed the day before their testes were 

 brought to me. 



July the 25th, at Q o'clock, I got two testes of a young ram, which they 

 had killed the day before at 1 1 o'clock before noon ; these were larger than any 

 I had seen this year. I immediately examined one of them, opening the part 

 before-mentioned, and discovered the animalcula in so great a number, and like 

 clouds moving among each other, as to afford a very pleasing sight. And this 

 I continued to do till 12 o'clock ; and consequently till the testes had been 25 

 hours out of the ram's body, and had Iain wrapt up in a paper upon an earthen 

 dish, and were exposed to the cold of the whole night. I then took a second 

 testicle, on which I had as yet made no remarks, and I bound it up in a linen 

 cloth, and kept it in a warm place, in order to view it the next day; and I ob- 

 served the first testicle till 5 o'clock in the afternoon, at which time I saw some 

 animalcula living; but at 12 o'clock before, I discovered a hundred living ani- 



VOL. V. 4 N 



