[ 347 1 
An AbflraSi of a Letter from Mr. Anthony Lc€liv/en- 
hoeck 0/ Delft about Generation hyan Animalcule 
of the Male feed Animals in the feed of a Frog. 
Some other Obfervahles in the parts of a Frog. Di- 
geftion, and the motion of the blood i/^^ Fea- 
vor. - 
HAving been foUicitoiis to examine the generati- 
on of Frogs, upon the account of their young 
ones being like a Worm, with a round thick body 
and a ftiort tayle: I was furprized to find that the Male was 
not joyned to thei^^/?2^3^/^in Copulation, but that heon- 
ly fate upon her; andhAd no Membrtim Mafeulumi that 
at the fame time when the Famale c^Q: her Eggs or Spavpn^ 
the Male aifo dropt his Seed ; which is to be ipread under 
the Eggs : in like manner as the Seed oiFiJhes that want 
x\\Q MembrumMafculum hc2i^\mdtt thej^^j- of the 
maleythztthQ\Jm?nah'a in femine may conveniently im- 
pregnate the eggs. For I hold it neceflary that fome one 
of the Animals i?>2 femine ihould. get into a certain ■^/^^i^V?/^^ 
of the yoak of the egg ("which point is only fit to receive 
it, and give itthe firit Nourifliment, till fuch time as the 
Egg comes to be fat on) But if no one Ammal fliould find 
this then the Egg is unfruitful: and this may be a 
r^afon why there are fo many thoufand more Animals in 
femine Mafailo, then Eggs in the female, 
Infeveralofmy Obfervations I had not found the 
nimals taken out of the TeJHcles andVafaDeferentia ol 
Froggs to be alive. But on the firft of April when Froggs 
were ready to fpawn, I took feme of the Males fitting up- 
on the Females, and fqoeezed their hinder parts that I 
might get the feed out of the V^f(^ defer entia but the Ani- 
* By this 1 o.nt or fpeck i^c means the Cicatncula. 
malcules 
