( 593 ) 
W. The AbjtraB of two Letters f cut fome time 
fince by *Mr. Anth. Van. Leeuweahoeek to 
Dr. Gale and Dr. Hookc. 
TTAving examined the Te/lkles of a Rat y and the Li* 
Jtl quor prefs'd out of the Seminal Veflels thereof, I 
found a great number of Amakules long and fer pent- 
like, as is reprefented Fig. 4. which (hews one of them 
dead. The Liquor it (elf in which they floated was 
tranfparent and oyly, full of irregular Parts, befides the 
Amakulesfcomz whereof lay turned up round, and feem* 
ed not to be full grown or Eving ; and I conceived the 
irregular Particles were the Beginnings or Rudiments of 
theie Animalcules ' which were generated in the Thred° 
like Veflels of the Teflkles. I fuppofe the manner of 
their Generation differs from that of the Eels I have for- 
merly obferved in Vinegar, which carry their Young 
in their Body, whereas I believe thefe are produced 
• from an Egg. And pcffibly they may have their begin- 
ning with the Generation of the Animal, and come to 
perfection together with it, remaining in the Seed in 
the Teftkles in Fieri, till the Animal it felf is fit for 
Copulation ; as in Man till about Fourteen Years, and 
then firft have Life and Perfection. 
The particular Goat of thefe threcllike Vejjels is ex- 
ceeding thin; and the Amakules therein contained 
very minute,that 10000 of them equal not oneThred; 
whence may be computed the vafl number onzTejlkle 
is capable of containing. Thefe Threds are more con- 
(picuous in the Tefticleof z Rat than any Animal. 
Endeavouring to examine the. Seed of Mufiks- in-: 
/March when they (pawn, I was fomewhat prevented • . 
only in the Liquor contained in their Shells, L found 
many 
