Bauhaus-Universität Weimar

20 O F T FI E VITAL AND 
tlie derivation of the fpirits into them fhould be intercepted. If it 
be faid, that the auricles are ready to contrail when the fyfiolc of the 
ventricles begins, but that being weaker mufcles, they mull wait 
till the fyfiole is finifhed # : I anfwer, that, if this were true, the au¬ 
ricles fhould become pale and tenfe while the ventricles are con¬ 
tracted, fince, when the influence of the nerves acts more flrongly 
on any mufcle, it becomes equally hard, whether it be allowed to 
contract, and its extremities to approach each other, or not. But 
further, as an influx of fpirits into the fibres of any mufcle muff 
be immediately followed by an endeavour in them to contract, fo, 
if this be prevented, as foon as the fpirits are again intercepted, their 
influence to^ produce any contraction will ceafe. This is the cafe 
with fuch mufcles as are under the power of the will, where any 
hidden but not continued effort, if it is not allowed that inflant to 
take effect, immediately vanifhes ; nor is it to be doubted, that the 
fame thing muft happen to the auricles of the heart. But, be this 
as it will, it is evident, that the alternate motions of the auricles 
cannot be owing to any compreflion of their nerves ; fince it is ac¬ 
knowledged, by the heft anatomifts, that the courfe of thefe nerves 
is fuch as cannot fubject them to any alternate preffure ; which is 
alfo true of all the cardiac nerves in thofe animals whofe hearts 
have only one ventricle* 
7. In dying animals, the right ventricle continues to contract after 
✓ 
the left ventricle has ceafed, and the right auricle performs its mo¬ 
tions for fome time after its ventricle f. But thefe alternate mo¬ 
tions of the right ventricle and auricle, cannot arife from any com¬ 
preflion of their nerves ; fince, in the firft cafe, neither the aorta nor 
the left auricle are dilated with blood at the end of the fyßole of the 
right ventricle ; and in the latter, the pulmonary artery alfo remains 
empty. In frogs and fifhes, whofe heart has but one ventricle and 
one artery going out from it, the alternate motions of this organ 
are as regular as in men and quadrupèdes: and it is well known, 
that 
* Beîiin. de motu cord. prop. 2. Keii’s anatomy cap. 3. fe&. iv. 
f Harvey .de mot. cord, et fang. cap. 4.
        

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