126 Of Animalcula in Fluids . 
fentation of one with a forked tail. Monfieur Joblot 
faw but one of thefe in 36 years obfervation : e how¬ 
ever, the folar microfcope feldom fails of difcovering 
iome of them every obfervation. That marked D, al¬ 
though its mouth feems different from the reft, is not fo, 
but owing to its not being reprefented in the fame pofi- 
tion. They are to be applied to the microfcope by 
taking up a drop of the vinegar on a pin’s head, and 
placing it upon a hollow glafs flip or flider. When 
this drop begins to evaporate, their motion will be 
conflderably retarded, at which time their mouths may 
be feen, and many other particulars may be obferved in 
them. 
Some people have imagined, that the fharpnefs of the 
vinegar, is occafloned by the eels ftriking their pointed 
tails againft the tongue and palate; but it is very certain 
that the foureft vinegar hath none of thofe eels, and 
that its pungency is intirely owing to the pointed figure 
df its falts, which float therein. 
Animalcula in the fhape of eels are often found in 
many infufions but of a different fize. 
Dr. Power obferves, that if vinegar, in which thefe 
eels abound, be but moderately heated, f they will all 
die, and fink to the bottom. But cold does not hurt 
them, for after fuch vinegar had been expos’d a whole 
night to the fevereft froft, and was frozen and thawed, 
and frozen again, and fo feveral times over, they were as 
brifk as ever: he alfo tells us, that he put fome vinegar 
full of thefe eels into an effence glafs, and poured thereon 
about the fame quantity of oil, which floating on the 
vinegar, all the eels would conftantly creep up into the 
oil, 
e Joblott’s Obf. p. 2, Imprime a Paris. 1718. { Power’s 
Micro. Obf. p. 34. 
