101 
Of the Semen Mafculinum: 
moving to and fro, (he obferved the fame thing In the 
milts of pikes or jacks) that according to his computation 
10,000 of them might be contained in the quantity of 
one grain of fand *. Whence he argues, that there are 
more living animalcula in the milt of one cod-fifh, than 
there are people alive upon the face of the whole earth, 
at one and the fame time. He computes one hundred 
grains of fand to make the diameter of an inch, then a 
cubic inch will contain a million of fuch fands. And as 
he found the milt of the cod-fifh to contain fifteen inches, 
it mull contain fifteen millions of quantities as big as a 
grain of fand ; and if each of thefe quantities contain 
10,000 animalcules, the whole muft contain one hundred 
and fifty thoufand millions. Then to calculate the num¬ 
ber of people, he reckons a great circle to contain 5,400 
Dutch fquare miles : whence he calculates the earth's 
furface to contain 9,276,218 fuch fquare miles: and fup- 
pofing one third of the whole or 3,092,072 miles to be 
dry land ; and of this two thirds or 2,061,382 miles to 
be inhabited. And fuppofes farther, that Holland and 
Weft-Frizeland are twenty-two miles long, and feven 
broad, which makes 154 fquare miles: the habitable part 
of the world is then 135385 times the bignefs of thofe 
places. 
If the people in thefe two provinces are fuppofed a 
million, and that all the other parts of the world are as 
populous as thefe, which is improbable, there would be 
*35385 millions of people on the face of the whole earth: 
but the milt of this fifh contained 150,00© millions of 
animalcules, which is ten times more than the number 
of mankind. 
The feminal vefTels of a cock 1 being opened, and a 
fmall drop of the femen fqueezed out, and applied to the 
H 3 microfcope, 
* Arc. Nat. Tom. i. Part ii. p. 9. t p^U. Tranf. No. 279, 
