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And they were such rare days for enjoyment, could she have forgotten her own heart: across the blue waters to Capri, with a visit by the way to the famous Blue Grotto; a whole day in that lovely town, walking about its winding, climbing streets; the long drive from Sorrento to quaint Prajano, with, on one hand, towering, rugged limestone cliffs, to whose rough sides, every here and there, clings an Italian village, and, on the other, the smiling, wide-spreading Mediterranean; the little rowboat ride to Amalfi; the day full of interest spent there; and then the drive close beside the sea toward Palermo, terminated by a sharp turn toward the blue mountains among which nestles La Cava; the railway ride back to Naples.
With the aid of glasses it was seen that every part of the shore was laid out in plantations, while the natives were observed running along the shore waving small white flags, which were, of course, looked on as an emblem of peace. They were answered by hoisting a Saint George's ensign. Several canoes paddled alongside, and the people in them, after presenting the cava root, came boldly on board.
This carries it, through its different branches, all over the body, where the tissues suck out their food and oxygen through the walls of the capillaries, and return it through the small veins into the large vein pipes, which again deliver it into the vena cava, and so to the right side of the heart from which we started to trace it.
This may be observed in sarcoma of the kidney, the growth taking place along the renal vein until it projects into the vena cava. [Illustration: FIG.
The superior vena cava receives blood from the head and the upper extremities; the inferior vena cava, from the trunk and the lower extremities; and the coronary veins, from the heart itself. With the left auricle, the four pulmonary veins. These receive blood from the lungs and empty it into the left auricle. With the right ventricle, the pulmonary artery.
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.
A short walk disclosed plantations "well laid out and kept," but as eatables seemed scarce, a departure was made the next day for Amsterdam, the waves breaking high upon the rocks as they followed the coast. Off the southern point of Amsterdam several canoes came out, and their occupants came aboard without hesitation, presenting cava root as a peace-offering.
Lastly, if no one denies the possibility in man, oxen, and the larger animals generally, of the whole of the ingested juices passing through the liver, in order to reach the vena cava, for this reason, that if nourishment is to go on, these juices must needs get into the veins, and there is no other way but the one indicated, why should not the same arguments be held of avail for the passage of the blood in adults through the lungs?
Now if the vena cava be taken up with forceps or the thumb and finger, and the course of the blood intercepted for some distance below the heart, you will at once see it almost emptied between the fingers and the heart, the blood being exhausted by the heart's pulsation, the heart at the same time becoming much paler even in its dilatation, smaller in size, owing to the deficiency of blood, and at length languid in pulsation, as if about to die.
When you think you have a "pain across the kidneys," it is usually a pain in the muscles of the back much lower down, and has nothing to do with the kidneys at all. A very large artery carries the blood from the aorta to each side of the kidney, and a large vein carries the purified blood back to the vena cava and heart. The kidneys then are big filter-glands.
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