| HEA 
“Gt is only more prompt, for the reafons which I fhall adduce, 
The following experiments prove inconteftibly that the 
nomena of. death in this cafe are conneéted in the order ju 
de 
fcribed, 
1. I have conftantly found black blood in the red-blooded 
tpBem of of all animals killed by concuffion or compreffion of 
the eir heart is livid, and all the the furfaces are coloured 
nears! as in in afphyaxia 
2. I have opened the carotid ina dog, and red blood im- 
mediately flo flo wed: the artery was then tied, and = animal 
killed by a violent blow on the occiput. The animal life 
was inftantaneoufly annihilated; all voluntary motion “pete 
the mechanical, and confequently the chemical phenomena 
of refpiration were arrefted, When the artery was now fet 
at liberty, it poured out black blood with a feeble jet ; this 
gradually diminifhed, and the motion of the heart ceafed 
after a few minutes 
co 1 have always obtained a — refult by opening an 
artery in various animals, and killing afterwards, either 
by a feétion af the medulla ea 8 Hetyrcen the firft verte- 
bra and the occiput, by comprefling {trongly the brain pre- 
vioully laid bare, or by the deftruétion of that organ. Animals 
die in the fame manner when noxious matters are — 
8 
has m 
of Gaughtering. If a blow on the very violent, 
blood runs out quite of the venous colour: if it fhould 
only weaken the intercoftals, the colour of 
the blood is not 
ing goes on naturally, the eal “led is 
andi it has a cock tint whos that funétion is 
cade g geet n able, by a rohan exertion, 
eo pr Sang Oe this fact does not 
5 as — di = dips of Stahl afferted, the influence of the 
organic life, but merely on the 
Gadieiiial chanteste of refpiration, which, as well as me 
chemical phenomena, muft have been previoufly Hovees- 
animals the death of the heart rie 
that of the brain fo nee Circulation will oe for 
a confiderable time in the frog and 
topped. fince the heart’s aétion; acocs cording to our 
Ss mma ceafes, after that of the brain is interrupted, 
ly becaufe the dies previoufly, there ought to exift, 
=e of the brain and that of the heart, an in- 
qual to the tine during! which refpration may be 
tie. the natnral ftate. 
po "Trait de la Struture, de PAGion, et des Mala- 
dita Chews, par Senac; tom. 2. 4to. 2d edition, Paris 
1783. Haller, ee eee 43 and ag 0 29, 
umani. 
: 
SSR 
DEF 
: 
: 
he this fenfe it 1s fyn 
HEA 
er,  geoages of.. See Carns, Riek 
EART of a Tree, the middle ore tee taken longitue 
ft dinally, is Aled fo . é 
HEart, in hp Re e. Ahorfe that works in the mane manege. 
with conftraint and echelon. vy mong “ brought to con~ 
fent to is = to be a horfe o 
Heart, in Sea Lan ie eee of dead-eye, 
loeatwbat pelention the fhape of a heart, but differing from 
with 
They are principally ufed acpi 
tain the fend by which the ftays are extended. 
Hearvr’s Eafe, in Botany. See Viora. 
HEART hod or a feed. See CARDIOSPERMUM. 
Heart+haped Leaf, in Botany, folium cor a. 
whofe outline pes bios: ad the alee idea of the fhape of an 
52 heart. See Lea 
HearrSbells, Coach cord pegs in Natural Hiflory. See 
CarpiuM under Concuo 
e — er cores. 
HEARTH, Focus. See eben dies onl sab &e. 
HEARTH-money. See CHIMNEY-money. 
Hear ae. See Fire-/fone 
Hearrn, in |Mining, is Seolied, in Derbyfhire, to the 
ancient lead-fimefti ting furnaces, which were like a black- 
{mith’s forge on alarge {cale, blown by ella world “af 
water. Since eee. or low Bi kaape song furnaces 
HEAT i is a term ufed by fome writers t o figufy the 
caufe which produces in us the ectsbine of warmth, Ia sifo 
ynony mous ier and ¢ . It is 
ufed to denote the fenfation itfelf of warmth, in sae 
is oppofed to cold. 
an extremely fubtile and e 
other matter, and of infenfible gravity ; 
a property 3 matter, and to 
of vibration of its ultimat 
nions will be found 
perties of heat pointed out, under the 
Heat is unqueftiouably one of the mot i Ne liste 
employed by nature in forming the conftitution of sl 
and in gpsints 2 that at 
developement, and many of its nes: ong 
cat, COLD, Conaustiox, ExcrtaTion of : 
