DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.4812#0108
gg OBSERVATIONS ON THE
of the cals dire&ly into the other ftomachs. Nay, srom the stru&ure os a
gutter which leads srom the oefophagus, through the feveral stomachs, it is
evidently intended that drink ihould, on particular occasions, pafs from
the oesophagus diredly into the third or sourth stomachs, without enter-
ing the sirst or second ftomachs.
In like manner, in quadrupeds and birds, the inteftina caeca must be
silled by a regular action os the muscular coat upwards, and emptied by that
motion reversed.
to. When the blood irritates the auricle or ventricle os the heart, these
contract with so hidden a jerk, that the blood is thrown srom them nearly
in the same manner as if a blow had been given to these organs by an exter-
nal agent. Hence, perhaps, we cannot, as Dr Hales has suppofed, de-
termine the force os the heart by observing the height to which the blood
afcends in a tube inserted into a large artery, or we lhall only be able to de-
termine that when we can reduce to calculation the essed os the vis percus-
sionis.
The sorce and srequency os the adion of the heart are generally propor-
tioned to the quantity and quality of the blood. But, when a very great
quantity os the blood has been lost by a wound, the pulse becomes more
instead os lefs srequent. From which we may observe, that the action os
the heart is regulated not merely by the quality or quantity os the blood,
nor by the distension of the sides os the heart, but also by the ufes which
an increase os the frequency os its adions may ferve.
The adion os the heart is also greatly inssuenced by the paffions os the
mind.
• • ii. When
of the cals dire&ly into the other ftomachs. Nay, srom the stru&ure os a
gutter which leads srom the oefophagus, through the feveral stomachs, it is
evidently intended that drink ihould, on particular occasions, pafs from
the oesophagus diredly into the third or sourth stomachs, without enter-
ing the sirst or second ftomachs.
In like manner, in quadrupeds and birds, the inteftina caeca must be
silled by a regular action os the muscular coat upwards, and emptied by that
motion reversed.
to. When the blood irritates the auricle or ventricle os the heart, these
contract with so hidden a jerk, that the blood is thrown srom them nearly
in the same manner as if a blow had been given to these organs by an exter-
nal agent. Hence, perhaps, we cannot, as Dr Hales has suppofed, de-
termine the force os the heart by observing the height to which the blood
afcends in a tube inserted into a large artery, or we lhall only be able to de-
termine that when we can reduce to calculation the essed os the vis percus-
sionis.
The sorce and srequency os the adion of the heart are generally propor-
tioned to the quantity and quality of the blood. But, when a very great
quantity os the blood has been lost by a wound, the pulse becomes more
instead os lefs srequent. From which we may observe, that the action os
the heart is regulated not merely by the quality or quantity os the blood,
nor by the distension of the sides os the heart, but also by the ufes which
an increase os the frequency os its adions may ferve.
The adion os the heart is also greatly inssuenced by the paffions os the
mind.
• • ii. When