( 4°5 ) 
could not find the Mites. As for the other three Eggs, 
there came a young Mite out of one of them upon the 
fame Day 5 and on the 1 ath Day came out another Mite, 
but could not thruft out his Body above half way, and 
did not live above a Day 5 which might proceed, as I 
imagine, from its being ftuck faft in that glutinous Mat- 
ter, with which the Egg was furrounded. As for the 
third Egg, it lay length-ways to the fight, and I ex- 
pefted before three Days, that the young one fhou’d 
have come out, computing that the Animalculnm was 
arriv’d to the full growth in the Egg, and that it had 
fill’d it in length and breadth 5 and there was alfo 
a Tranfparency in the Egg : At laft, there came a little 
Mite out of the third Egg, contrary to my Expe&arion 5 
which Mite, I imagin’d, dy’d in the Shell before it 
could get quite out of it. 
When we confider, that the £ggs of Mites are laid 
one after the other 3 and that in the Copulation of 
thefe Creatures, a great many of their Eggs 
are impregnated at the fame time, accord- 
ing to all probability $ and moreover ob- 
ferve, that in the differing fuch an Animal- 
culum , the Intrals thereof cannot be exa&ly 
diftinguifh’d, how fmall muft the Animal- 
cuU be that are found in the Semen Mafcu- 
linum thereof. 
Now fince there are many People that 
don’t know what a Mite is, and many 
more that never faw the Eggs thereof, I 
have thought fit to compare the bignefs of 
their Eggs, by reckoning a certain number 
of them againft a Pidgeon’s Egg. Now if 
one Egg of a Mite be equal to the Diameter 
of a Hair of ones Head (as it appear’d to 
me thro’ a Microfcope,) and 6 00 Hairs of a 
Man’s Head laid by one another are equal 
600 
goo 
150 
450 
450 
22500 
1800 
202500 
450 
10x25000 
8 1 0000 
911x5000 
to 
