HE 
priate cbied: namely, . That heat has a paregee to 
diffule itfelf, 2. That the. quantity of heat ina body is 
_ limited. 3. That. the sents of heat in an homogeneous 
body of a given temperature is as its bulk. 4. That the 
variations in the quantity “Of abfolute heat in an homogeneous 
body, while it retains its form, are nearly proportional to its 
variations temperature, as lneikieet’ b mercurial 
} on rap ‘5. That the capacities of bodies for contain- 
ing heat are nearly ae male while they retain their form. 
6. That when, by expofure to heat, folid. bodies become 
fluid, they abforb a portion of heat which is neceflary to 
- fluidity, and which does not — their temperature ; 
when, by, expofure to cold, they become folid again, 
ty z Pat with the heat which thingy had before abforbed,—that 
water is converted into vapour, a quantity of heat is 
Tyioshed, which does not increale the temperature. And, 
7, That unequal quantities of abfolute heat are neceflary, 
to. 0 eam equal changes of temperature in heterogeneous 
bod 
Th eas — 2 thefe facts are fufficiently home to 
be adinitted as ax s, yet others are not fo, and e caro 
queftion itil aha de as to their accuracy ; but Cetaiie Al 
doubtful, the circumt{tance will fearcely affe& the he 
conclutions refpecting the origin and diffufion of animal 
| Crawford advances the following feries of — 
1, That the age Sa of abfolute heat contain 
ae 
and the quantity a heat in aii 
rtional'to 
a great variety of very ingenious but 
the heat imparted by elaftic a 
former part of the propofition is the hike fia effential 
the. theory 3 ; =e latter part is probably incorreét, as wid 3 
nown at that 
time. His ith cond propofition is, that the blood which pafles 
from the aS: to the heart, by the auld te vein, contains 
other x eres being ca 
‘experiments with the blood of a fheep, j 
: various > 
patticular bo operated upon, it does not feem proba- 
Medes: the propio is univerfally Boat The bese: or 1 propo- : ‘the 
animal is laced:in are § 
peg is, that whe 
colour-of the rena blood appreac 
of the arterial, than when i 
: - earbonic acid’ 
time; in 08 former inftance, is lefathan that which it ph 
ticates, d itty laa iteced bes in ‘the latter 5 ee 
pure 
the anantite 
shee <i oa of wax or maneodoe 
Vou, XVII. 
life. This Hane ae is fup-~ 
erial and venous blood were . 
A T. 
and i important ne ah is fi pancreas by the rf of 18 
experiments, The firtt confifts in. immerfi 
warm ater or alr) a ie dines and then draw- 
rker hue than ir 
The fecond, third, fourth, fifth, fixth, 
= feventh etn thew that a fmall ei fuch asa 
tity of oxygen required, or which difappears in the procefs. 
The tenth thews the quantity of heat produced by a guinea- 
wifi Ripe ars, yrs found in the carbonic ae 
= this i . tk can ¢ tha weight if the charcoal is to 
at of t okyeen s Peles near] more recent 
ie iciees experiments of ot! wuthors find’ the ratio 
I to 2.6 ne 
of ahem nothing but carbonic a is produced, 
re 
nth experiment feems to prove that in the vehi 
fad of 4 a guinea-pig fome of the oxygen: is {pent in pro- 
auedog aqueous vapour; but other experiments, ‘fince 
n more favourable circu umftances, d rrant 
this conclufion. 
e heat communicated to a 
100 ounce mea- ¢ by the aehibultion of wax imparts 
— of pure by the combuition of charcoal imparts 12° -3 
ir alt b 
ae of éstiperitiite 
Pm through ia 
ter 2 i 
. 7 te the orate till: it 
ae é fame as would be 
a: “pr mi in a quantity 
sthly: ae 
the ‘emma 
of! a - and t of its. ition to the 
various rnc! the eee muit be: confidered a ee 
- demonttrated 
‘ 3 
