The Hive ‘TO Rx 
fuch a degree of firmnefs, that I could but juft 
feparate them from the adjacent parts. Tho’ 
the tail moved about pretty violently, I could 
not clearly notwithftanding difcover its mufcles, 
as well becaufe they were extremely minute, 
as becaufe the fame wonderful fluidity and 
fpherical configuration fhewed itfelf in the 
parts of thefe organs of motion. However, 
f could plainly perceive them growing in an- 
other little Frog, near the root of the tail. 
The ‘colour of the animal’s internal parts was 
a dark gray. This proved another obttacle to 
my anatomical inquiries, by caufing, in all 
their appearances, an immediate confufion. I 
could difcover nothing more than I have al- 
ready mentioned in fome of thefe Vermicles of 
Frogs, which I had fet apart as larger, and 
confequently fitter for diffeGticn than others. 
I could only obferve, that thofe round particles 
or grains, of which I {faid, at my fetting out, 
that the eggs confifted, went likewife to com- 
pofe the fkin and internal parts of the Frog. 
A circumftance that could not fail of furprifing 
me greatly, and the more fo, as they were con- 
fiderable and diftinct enough to be feen with 
a common microfcope. 
At this time, namely, on the 2d of May, I 
caught a Frog, which had not as yet difcharged 
her eggs; for which reafon I opened her, and 
fed with them my young Frogs. This ani- 
mal’s miffing the ufual feafon for this opera- 
tion, might be owing to her wanting a male, 
or to her being in a fickly condition. Be that 
as it will, her eggs did not unfold themfelves 
on being thrown into the water, like the 
others. 
On the twentieth day of thefe experiments, 
which was the 7th of May, the fimbriated 
appendices, Tab. XLVIU. Fig. x11. cc, had 
begun to difappear; and were no more to be 
feen on one fide of a Frog, fomewhat bigger 
than the reft. This made me eager to invef- 
tigate the caufe of fuch a change, efpecially 
as the appendages of the left fide, which had 
not as yet totally vanifhed, ftill continued in 
motion. In the courfe then of my inquiries 
for this purpofe, I obferved, that the fkin of 
the body, which lay between thefe particles, 
had grown over fo as to cover entirely that of 
the right fide ; and had already begun to take 
in, after the fame manner, the particle on the 
left. J afterwards difcovered, that the two 
particles I have exhibited as lying on the ani- 
mal’s thorax, under its head, with a dire€tion 
downward, had each of them a paflage to 
that part under the fkin, which appeared to 
extend towards the fimbriated appendages ; 
but I could not be fure of this circumftance, 
on account of the extreme tendernefs of all 
thefe parts in the young Frog. However, I 
hence, with great reafon, fufpected that thefe 
particles might afterwards poffibly grow into 
the young Frog’s branchiz; for I alfo obferved, 
that the particle, which the fkin had already 
* No creature affords more entertainment or inftruétion, by tl 
the male we have already mentioned. The circulation of the bl 
more beautifully than in any other creature. 
of INSECTS. Irs 
over-run on every fide, had likewife loft fome- 
what of its original appearance and form. 
The protuberant inteftines might now be 
more eafily difcerned; and their termination, 
at the place already mentioned, Tab. XLVIII. 
Fig. xr. d, was become much more con{pi- 
cuous. The pulfations of the heart, at this 
period very firong, were likewife very vifible 
through the tranfparent {kin *. In the tail 
the cartilaginous vertebre, and the mutcles 
fixed to them on each fide, fhewed them- 
felves very diftinétly, and, in a beautiful man- 
ner, refembled a goofe-quill branching on both 
fides into fmaller feathers; for thus, nearly, 
thofe mufcles hung to the cartilages which 
they were to move. _ 
In diffecting the little animal, I found its in- 
teftines were increafing every way by degrees, 
butin length efpecially ; to favour the increafe 
this way, they were rolled up into coils, on ac- 
count of the fhortnefs of the body in which 
they lay. But they were, however, as yet ten- 
der, and their external coats {till confifted of 
little globules. Icould now juft difcern the 
ftomach, as likewife the liver and gall-bladder‘ 
of an aqueous or watry colour, and compofed 
likewife of {pherical particles. The entire liver 
confiited alfo of grains of the fame form, and 
the very heart itfelf, which I took panting out 
of the body, and at every fyftole ufed to fill 
with thofe grains, the little tide of whitith 
blood it drove into the arteries. 
Upon the whole, it was manifeft, that the 
heart was formed in the little Frog, in much 
the fame manner with that of Chickens, ac- 
cording to the account given us of them, by 
that illuftrious anatomift, Marcellus Malphigi. 
The blood-veffels alfo, now fhewed themfelves. 
The eyes, and all their humours ftill confifted 
of little globules; as did even the black part 
of the uvea. The mouth, contracted like the 
mouths of Fifhes, was grown a ereat deal 
more wide and fpacious, tho’ not fo large in 
proportion, by many degrees, as that of a Frog, 
arrived at its full growth ; or even of a young 
Frog that has juft thrown off its tadpole fkin ; 
as fhall be illuftrated with a figure in its pro- 
per place. As to the particles which formerly 
lay on the outfide of the thorax below the 
mouth. I could no longer fee any thing of 
them; nor have I made any other obfervations 
concerning thefe appendages, befide thofe al- 
ready mentioned. 
May the twenty-third, which was the twenty- 
fixth day after the young Frogs had left their 
white fubftance, I received a fupply of little 
Frogs from the country, in a flat-bottomed 
earthen pot. 
Having before diffected all thofe that I had 
hatched and and raifed myfelf, left the little 
animals fhould be killed in the patlage by the 
continual toffing of the water; and in order to 
afford them refting places, I ordered, by way 
of prefervation, that the pot fhould be nearly 
ne microfcope, than the Frog. he animalcules in the femen of 
ood is feen in the mefentery, by the help of the folar microfcope, 
filled 
