ae 
=A 
7 
‘become at the fame time more frequent, and hence 
_ of two or more feconds, or e 
HEART. | 
‘veins. fil the auricles at the fame etapa that the ventricles 
expel their contents into the arte 
« The contractions of the 7: art beco me gradually 
uifhes aay: | to death: the 
the nulls 
perfons near their death is > foal and rapid, that it can- 
not be counted. Intervals are then obferved between the 
contractions of the heart, and are indicated by intermiffions 
of the pulfe, and irregularity in the refpirations ; : thefe are 
ven a minute in living animals, 
T havé obferved in the incubated chick, as it grew weak, 
firft ten, then fix, four, and two pulfations in a minute. 
The left Sr atage or the heart then ee to at, the ventricle 
firft, and then the auricle. The pulfation of ‘the right ven- 
tricle lafl longer ; it contra¢ts lefs frequently than the auri- 
cle, and grad becomes quiet ; Sing? pene being 
fill Seealonally obferved on the furface. The retains 
its irritability longer than any other sant of the feigticlas, 
and the feptum comes Bove in this refpect. Motion gene- 
o 
t ee in warm water or air, or in any other way, it ve 
much exceeds the ventricle. Its motion is very lively, and ae 
pulfations are more rag than thofe of the left, In fom 
cafes it has ceafed to move 
joins the auricle, always continues to pulfate for a long time, 
and fometimes holds out even a4 than the a auric On 
the left fide, the ventricle ¢ 
reft. The latter have a fynchronous motion with the venz 
cave, fo long as they continue to aét; but mo- 
tions grow feeble, the vena ca fuperiority, both 
in the freqnency and the duration of the p .. 
cuoufly as in the heart the conftant pede? neg as any 
intermiffion, from the earlielt peri e to the 
Moment of death, of fo confiderable a i patente power. 
As the important funétions dependent on the circulation, 
fuch as bebe fecretion, exhalation, and the expofure o 
the blood to the air can on] ried on while the heart’s 
the part firft obferved to move in the embryo, and why t 
Uninterrupted continuance of its action is neceflary is the 
fupport of lif ink that Haller has hardly 
Elementa 
ix. “ Denique f. 
ein qui ie & incu to continetur, comparavi miram vivaci- 
et igneam vim corculi, a finem fecundi diei duriuf- 
et diffluente ty que 
aqua copier ffunt enim Harveii e 
mentum rep ‘ke Sy ccrcabes Asarulay ist 
irritatione arteriarum 
vel eminus fimile aut minimum motum excitare 
i fag sore aut animale calido, naturam fumme irrita- 
ae cordis, i 3, Sychmet vis contra¢tilis arteriarum, et perfedt= 
n frigidis inertiz, et immobili corpori uarum 
oppofui. A titudinem denique ad motums 
et tehacieatea vite expendi, quz in Bhi ett, A sae pre- 
ter inteftina, nulla alia pars machinz animalis His 
omnibus confideratis precipuam, et parum ky me  diftans 
tem, motus omnis in Pia re {caturiginem in corde reperio.”” 
Lib. 4. feét. 4. 
In the tite ey Min Asp: mentioned that the func. 
tions of the brain, the hear the lungs, are fo connected 
n confidering n be influenced by the 
heart, this author tirft eftablifhes ‘i point, that it cannot 
be by means of the nerves: the fection, or ligature, of ae 
organs (the cardiac nerves) does not influence the funétion 
of the brain; and they only modify cellar the action of 
the heart. Confequently the veffels mu ut be the exclufive 
agents of the heart’s influence on the brain. 
heart, which propels the red blood, affects the brain, 
in the firft place, by the motion which it sR BD to 
the organ. 
era, is very confider- 
. the large arteries placed at its 
ony parietes of the cranium, 
experience at me of tee pubes a refiftance from 
the latter, ae duces the whole of the motion on the’ 
brain, fo that it is Navibnite. as ‘ents are; when fituated 
over a confi 
orce, andis . 
ig =o of influence, inthis cafe, is derived from 
the nature of the fluid whic heart of gee blood fends 
to the brain.” We refer on this ees to ao as it ts 
in that organ that the changes are pr the blood, 
which is conveyed through the heart gai phe 5 hitions 
The heart of k bl ood cannot i 
in 
the heart’s contractions are acce 
affering 
animal 
ee. is ied th with ane aee 
