\ 3*0 ; 
II. Tart of a Letter from Mr. Anthony van Leeu- 
wenhoek, to Mr. James Petiver, F R.S». 
Containing fome JMicr of copied Objer^ations up- 
on the Animalcula in Semine of Young . 
Rams. 
Delft in Holland , Augufl 18. 17 11. 
5 I R, 
H Aving about the time that you call’d upon me, 
employed my felf in Differing the Tefticles of 
a young Ram, I take the Liberty to communicate to 
you my Obfervations thereupon. At the latter end of 
the Month of J/ene r I procured two Tefticles of a young' j 
Sheep, to which they ftill gave the name of a Lamb, 
and I made a fmall Incifion in the lower part of each oV j 
them, where there was a Protuberant roundnefs, and 
from whence proceeded the Vafa Semen deferentia r 
Then I fqueezd a little whitifti Matter out of them, 
which I immediately placed before a Microfcope^ and 
having very clearly obferv’d a vaft number of Animal- 
cula living and moving, I was refolved not to ingroft 
the Spedfacle to my felt alone, but I call’d four feveral 
Per Tons to be Eye-witneffcs of the fame $ which I did 
the rather, becaufe I have been changed by fome Learned 
People, but not of our Town, that what I have af- 
firmed upon this matter was not true : And becaufe the 
Animalcula could not be feen fo diftin&ly, by reafon of 
the vaft number and the quick Motion of ’em in the 
•little flimy Matter, in which they fwamamong one ano- 
ther, I took a little Rain Water, about the quantity 
