( xi66 ) 
wrirage obferve the Semen MufcHlum, Not to trouble you 
with fome former attempts of thi^ kind, as loon as he was 
killed I took, out one of the Tefiicles with the adjoyning 
I Kiemhal Veffds^ and found the Vafa deferetJtia very turgid, 
and tuli o'i a milky fluid. After various mechods of view- 
ing this Liquor, I faw the AmmalcuU^ (in prodigious num- 
bers) very perfecSly in feveral poftures moving very briskly, 
and (hew*d them to others, who own'd they appeared as 
plain as Tadpoles to a naked Eye. The gre iteft task was 
to lay .them thin enough before the Microfcope, for when 
the matter is too thick, you fee nothing diftinftly, but on- 
ly a confused motion, and when thin fpread it dries im- 
mediatly, fo that you mufl: be very quick with it, or you 
will lofe youi Labour. 1 diluted fome of the Semen with 
warm Water, juft fo much as would a litre change the 
colour of the Water) and by that means could fee them 
. more diftinft and feparate, even with fmaller Magtiificrs, 
and they then kept their lhapes long, even till next day 
when put in a fmall Tube, but were without motion. To 
H^. D. my beft Clailes they appeared about the fize, and in the 
poftures here reprefented.^ 
In my Obfervations of the AmmalcuU in Waters I have 
many of the fame fpecies in the fevcral infufions, and even 
in Waters that have been expofed (efpecially at this time of 
the yearj any time without any parriculir mixture, fuch as 
you find in the hollow of a Cabbage-leaf,or on the Dipfacns^ 
Sec, and I am confident that many of thefe are rhe fame 
Creatures under different drelTes. For I have noted fuch a 
regular procefs in them, and fuch a conft-mr order of their 
appearance, that I am of opinion moft of them are the pro- 
dud of the Spawn of fome invifible Volatile Parents^ and 
generated like Gnats, and many other forts ot Flies, which 
are bred, and undergo many changes in the Water, before 
they take wing. But I pretend not to fufEcient obfervations 
to give you this for more than aconjefture. Some of them 
4ilfo may probably be originally Water InfeUs^ or fui 
generis^ 
✓ 
