538 Mathematical Correfpondence. [ Sept. 
examination, was not content with leaves, 
but, like tee elephant and rhinoceros, 
the ground in walking, The fhoulder- broke and ground the branches themfelvess 
blade is much broader than long. The Its clofe and flat-crowned teeth muft have 
€ avicles are perfeét, and the two bones of been very proper for this purpofe. The 
the fore-arm are diftiné andggnoveable pofition of the bones of the nofe, having 
upon each other. ' fome analogy with that of the elephant and 
The fore limbs are longer than the tapir, would induce a fufpicion that our 
hind. To judge by the form of the laft animal wore a trunk, but it muft have 
phalanxes, there muft have been very been very fhort,- fince the length of the 
Jarge pointed claws, enclofed at their ori-. head and neck together equals that of the 
inn a bony fheath. There appears to fore-legs. However this be, we find, in 
have been only three of thefe claws on the the abfence of canine teeth, and the fhort- 
fore-fi 
feet, and a fingle one on the hind. nefs of the muzzle, fufficient as a to 
The other toes feem to have been deprived conftitute a new genus in the fa ily of 
of them, and, perhaps, entirely concealed the ed:utated, which ought to be placed 
“beneath the fkin. between the S/oths and the Tatoos, fince to 
The head is the greateft fingularity of the fhape of the head of the formeryit joins 
this fkeleton.” The ecciput is elongated the teeth of the Jatter. It would be ne- 
and flattened, but it is pretty convex above ceffary to know particulars of which a 
the eyes. The two jaws form a con- fkeleton cannotinform us, fuch as the na- 
fiderable proje€tion, but without tecth, ture of the teguments, form of the tongue, 
there being only four on each fide above pofition of the mammz, &c. in order to 
and below, all grinders, with a flat crown » determine to which of thefe it approached 
and grooved acrofs. ‘The breadth of the the moft. In the meantime, J thought I 
branches of the lower jaw, jand the great might give it the gencric name of MeGa~ 
2pophyfis placed on the bafe of the zygo- HERIuM, and the trivial ane of Ameri- 
matic arch, deferve particular notice. > cau. . . 
ea This quadruped, in its charaers, taken It adds to the nutneraneies whieh 
together, diggers from all known animals; apprize us that the animals of rhe ancient 
and each of its bones, confidered apart, aljo world were all different from thefe which 
aiffers from the correfponding bones of all we now fee on the earth; for it js fcarcely 
knownanimals. "Chis refults from a de- probable, that if this animal fill exifted, fo 
comparifon of the fkeleton with that remarkable a fpecies could have hitherto 
of other animals, and will readily appear efcaped the refearches of naturalifts. It is 
to thofe who are verted in this kind of we- alfo a newand very ftrong proof of the in- 
fearches; for none of the animals which variable laws of the fubordination of cha- 
approach it in bulk have either pointed ge gets juftnels of the confequences, 
claws, nor fimilarly forméd head, fhoul-* 
and the leg bones ftill more fo in propor. 
tion. The entire fole of the foot bore on 

der-blades, clavicles, pelvis, or limbs. 
As to its place in the fyftem-.of quadru- 
peds, it is perfeétly marked by the fole 
infpe€tion of the ordinary izdicatory cha- 
yaciers, that is, the claws and teeth. 
Thefe fhow that it muft be claffed in the 
family of unguiculated quadrupeds defti- 
tute of cutting teeth ; and, in faét, it has 
firiking relations with thefe animals in ail 
arts of its body. ‘This family is com- 
poled of the Sé#ths (Bradypus, . L.) ; 
Tatoos (Dafypus, L.) ;, Pamgolins (Ma- 
nis, L.) ; Ant-eaters (Miyrmecophaga, L.) ; 
and Orpéteropus, or Cape Aut-eaier. 
[The writer proceeds to'a detailed com- 
parifon of parts of thefe animals with the 
tkeleton in queftion, which, for the fake 
of brevity, we omit. ] Pas. 
The great thicknefs of the branches of 
the lower jaw, which furpaffes even that 
of the elephant, feems to prove that the 
yak animal, which is the fubject of our ey 
nee deduced for the claifification ef ors 
ganiled bodies; and under both thefe 
views itis one of the mofi precious difcé- 
veries which have for a long time.beca 
made in natural hiftory, 

MATHEMATICAL CORRESPONDENCE, 
m 4 

On THE HEAT COMMUNIC 
ONE Bopy To ANOTHER. 
J: SEVERAL hypothefes have been 
propofed, for determining ‘the 
proportional heat communicated by one 
body to another,j but none of them have 
been fubjected to the ftriét examination 
of the geometer, and the refult com)par- 
ed with experiments. Sir aac Newton * 
fuppofes, that the heat of the fun is di- 
For the Monthly vcR ate 
ED BY 
rectly as the denfity of its rays, or reci- © 
precally as the fquare of the diftance of 
hoe ee ti tMitwiinn ai.> > 
* Principia Math, p. 466. 
the 
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