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Heart of a human embryo, eight weeks old, back view. a apostrophe left auricle, a double apostrophe right auricle, v apostrophe left ventricle, v double apostrophe right ventricle, cd apostrophe right superior vena cava, ci inferior vena cava.

We hear, O Srinjaya, that king Prithu also, the son of Vena, fell a prey to death. The great Rishis, assembling together in the great forest, installed him in the sovereignty of the earth. Beholding Prithu the son of Vena, all the creatures of the earth exclaimed, "We have been lovingly attached to him."

All things, in short, permit us to believe that in the embryo the blood must constantly pass by this foramen from the vena cava into the pulmonary vein, and from thence into the left auricle of the heart; and having once entered there, it can never regurgitate.

Inferior vena cava. 6. Renal arteries. 7. Renal veins. *Structure of the Kidneys.*—Each kidney is a compound tubular gland and is composed chiefly of the parts concerned in secretion. The ureter serves as a duct for removing the secretion, while the blood supplies the materials from which the secretion is formed.

At the entrance to the pulmonary artery are shown two of the pockets of the valve, the third pocket having been cut away with the front side of the artery. Starting from the great vein trunk, the vena cava, it pours into the receiving chamber, or auricle, of the right side of the heart, passes between the valves of the opening into the lower chamber, the right ventricle.

Now Roland, in his edition of Roger's "Chirurgia," criticises both of these statements of his master, as follows: Nota quod quamvis Rogerius dicat quod apponatur albumen ovi, non approbo, quia frigidum est naturaliter, et vena et nervus et arteria frigida sunt naturaliter, et propter frigiditatem utrorumque non potest perfecte fieri consolidatio.

The same sluggish flow of the inferior vena cava blood, plus the imperfect tone of the systemic arterial system, means that the circulation at the distal portions of the body the feet and the legs is imperfect when the patient is up and about, with the result of causing pendant edemas, which disappear at night when the patient is at rest and the heart more easily accomplishes its work.

It has now been known for some time that the primary stimulus of cardiac contraction generally occurs at the upper part of the right auricle, near its junction with the superior vena cava, and that this region may be the "timer" of the heart. This is called the sinus node, or the sino-auricular node, and consists of a small bundle of fibers resembling muscle tissue.

Which is confirm'd, for that its seen, that animals which have no lungs have but one onely concavity in the heart; and that children, who can make no use of them when they are in their mothers bellies, have an opening, by which the bloud of the vena cava runs to the left concavity of the heart, and a conduit by which it comes from the arterious vein into the great artery without passing the lungs.

The blood passes through the armpit, across the chest, into the great main pipe for impure blood, the vena cava, and through this into the right side of the heart, where it again meets the rich, but waste-laden blood from the food tube and liver, and starts on its circuit through the lungs and around the body again.