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Now this place is the heart, for it is the only organ in the body which contains blood for the general use; all the others receive it merely for their peculiar or private advantage, just as the heart also has a supply for its own especial behoof in its coronary veins and arteries. But it is of the store which the heart contains in its auricles and ventricles that I here speak.
And if at this time, the auricles alone pulsating, the point of the heart be cut off with a pair of scissors, you will perceive the blood flowing out upon each contraction of the auricles. Whence it is manifest that the blood enters the ventricles, not by any attraction or dilatation of the heart, but by being thrown into them by the pulses of the auricles.
CARDIAC TONICS.-Digitalis: There is no drug that can take the place of digitalis in loss of compensation in chronic valvular disease. It acts specifically for good, and it has its greatest success in the valvular lesions that cause enlargement of the left ventricle, on which it acts the most intensely. It also acts for good on the right ventricle. It has but little action on the auricles.
On each side are two cavities, the one being directly above the other. The upper cavities are called auricles and the lower ones ventricles. The auricles on each side communicate with the ventricles below; but after birth there is no communication between the cavities on the opposite sides of the heart.
These two motions, one of the ventricles, the other of the auricles, take place consecutively, but in such a manner that there is a kind of harmony or rhythm preserved between them, the two concurring in such wise that but one motion is apparent, especially in the warmer blooded animals, in which the movements in question are rapid.
In man they are more numerous in the left than in the right ventricle, more abundant in the ventricles than in the auricles; and occasionally there appear to be none present in the auricles. They are numerous in the large, more muscular and hardier bodies of countrymen, but fewer in more slender frames and in females.
The parcel contained silver spoons, forks, a pair of gold auricles, all unquestionably the property of the unfortunate nobleman; and the only question remaining was, whether Courvoisier was the person who had so left it. If he were, it would, of course, grievously for him, increase the probabilities that it must have been he who subsequently committed the murder, and with the object of plunder.
But that we may proceed with the subject which we have in hand, viz., the use of the auricles in filling the ventricles, we should expect that the more dense and compact the heart, the thicker its parietes, the stronger and more muscular must be the auricle to force and fill it, and vice versa.
He had a quaint conceit concerning his toes, not being able to rid himself of the notion that when he removed his socks they would rattle in the ends like bits of broken glass; and soon he was so cold that he felt a mild wonder as to how his heart could go on pumping congealed blood through the auricles and ventricles.
=The Heart or Pump of Life.= When the heart stops we die, because the blood can no longer flow to carry food and oxygen to the hungry tissues. The heart is a sac with thick walls of muscle. It is shaped like a strawberry and is about as large as your fist. Its cavity is divided into four parts. The two upper ones are called auricles and the lower ones are named ventricles.
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