A Short Explanation of the TABLES. 
ff Two thick thumbs, proper likewife to the 
male. 
FIG. IIL 
The Frog’s arteries. 
a The heart. 
6 The auricle, over which lies the origin of 
the great artery that iffues from the Frog’s 
heart. 
¢ One of the two main trunks of the great ar- 
tery, which is like the fubclavian vein, 
and runs towards the right fide of the thorax. 
d The other main afcending trunk, running to 
the left fide. 
ee Arteries of the lungs, which they only 
ferve to nourifh. I have here exhibited 
three branches of them, cut off. 
ff Two minute arteries, iffuing from the 
lungs, and running towards the parts of the 
mouth. 
gg Twoarteries, each of which fwells into 
two knots. 
bb Two very confiderable branches of the ar- 
teries, which arife from the afcending trunks 
of the great artery, then take a circular turn, 
and at length unite in the loins. 
zz The axillary arteries. 
kk The carotide arteries. 
11. The arteries of the vertebre. 
m That of the mefentery. 
zn That of the loins. 
‘00 Thofe of the tefticles, and ovary. 
‘p Thofe of the kidneys. 
gq The iliac branches. 
OG LW. 
Veins of the Frog. 
aa The upper trunks of the vena cava. 
& The place where the arteries are cut away. 
cc The place where the pulmonary veins are 
likewife cut away., 
dd Veins running to the parts of the mouth. 
ee Others running tothe head. 
oP fi Two veins, running to the mufcles of 
the fore legs. 
gg Axillary veins. 
64 Twoconfiderable branches, which run in< 
to the ilia under the fkin. 
zz The trunk of the vena cava, on the back. 
kk The vena cava in the liver. 
Z The vein of the mefentery. 
m The emulgent or kidney veins. 
nan The iliac. 
oo The epigaftric vein, running double at its 
origin. 
FP PaG.. Vi 
The motion of the mufcles in a Frog. 
aa Two tendons of a mufcle, held by the 
fingers. 
6 The dependent nerve of it, irritated; by 
means of which the mufcle contraéts itfelf, 
lix 
and fo draws towards itfelf, the two hands 
holding the tendons. 
Ret G. Vin 
The manner in which the thickne/y of the maufele 
increafes, during the contraction of the mufcle. 
a A glafstube, through which the mutcle is 
pafled. 
66 "Two pins run through the tendons of the 
mutcles. ae 
c The irritated nerve, by which it comes to 
pafs that the pins 44 are forced from their 
places towards dd, and that 
e The mutcle, in confequence of its contraction, 
fills the middle of the tube. 
Pob-GwooVi, 
The manner in which the heart, during its cons 
bs saree takes up les room, and leffens in 
ulk. 
a The heart, contracting itfelf within a fyphon 
or glafs tube, upon whofe piton it lies, 
bb A glafs tube. 
c A drop of water, adhering to the infide of 
the tube, which drop defcends while the 
heart contraéts itfelf. 
d The part of the tube, fhewing how low the 
drop of water ¢ falls at that time. 
BaleGe: WV 
The manner in which the mufele, at the ue of 
its contraction, comes to occupy a fmaller Space. 
a The glafs tube, or fyphon 
6 The mutcle. 
c A filver wire witha ring in it, through which 
the nerve pafies. 
d A brafs wire, with a rine on the upper en 
of it, through which ihe filver ap aa 
e A drop of water in the glafs tube. 
fF The hand that irritates the nerve, in confe- 
quence of which irritation the drop on the 
— mutcle, contracting itfelf, defcends a little, 
FIG. Ix. 
The fame experiment, fhewn after another 
manner. 
a 'The glafs tube. 
6 A little hole bored in the tube. 
¢ The nerve ftretched through the faid hole, 
TAB. LL, 
The hiftory of the Cuttle-Fith, 
Bal G, <i. 
The external parts or limbs of the Cuttle- Fi p 
| laid 
od 
