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The heat of the equator, raising up the water in steam, had formed a band of shade around the earth. From other worlds it must appear like a girdle of clouds almost similar to the sidereal rings. In this gloomy, hot sea was the heart of the ocean, the center of the circulatory life of the planet. The sky was a regulator that, absorbing and returning, restored the evaporation to equilibrium.
The liver, heart, etc., are not required, though to observe the relations of the circulatory system i.e., the heart and large blood-vessels to the respiratory system will be time well spent. Unless special instructions are given, the larynx, which the butcher may term the "weezend," may be lacking or mutilated.
One other fact should be impressed on the person with a valvular lesion and compensation, and that is that he has but little, if any, reserve circulatory power. While he is in apparently perfect health, it takes little circulatory strain to push his heart to the point of danger or insufficiency.
If the Germans had taken Paris they would have occupied the bodily heart, the centre of her circulatory system; but the spirit of France their heavy hands would not have clutched, for it never dwelt there. Paris is hard and hurried; France is not. Paris loves pleasure; France loves life. Paris is a brilliant stranger in her own land.
Before beginning upon the circulatory system, however, she sprang a surprise. "For your convenience," she explained, "I shall draw a diagram of the heart and its valves, and with your assistance I shall explain its action." After a little wrestling with the diagram, which would curl, she managed to pin it to the wall. She then proceeded, in red crayon, to draw a fully equipped heart.
These facts and deductions have given rise to the present day circulatory theory of intra-ocular pressure, so we now can approach the predisposing and exciting factors which determine glaucoma. The central fact to be borne in mind is, if the physiological pressure is vascular in origin and nature, the pathological pressure must likewise be derived from the same source.
Latterly, indeed, it has been proposed to study inventors by an objective method through the examination of their several circulatory, respiratory, digestive apparatus; their general and special sensibility; the modes of their memory and forms of association, their intellectual processes, etc.
The intestine presents a remarkable structure, the typhlosolis, or, as the old anatomists called it, an intestine within an intestine; and Claparede has shown that this consists of a deep longitudinal involution of the walls of the intestine, by which means an extensive absorbent surface is gained. The circulatory system is well developed.
Leofwin, however, whose eye was naturally caught by the pictorial, was gazing at the circulatory system on the wall. "What on earth is that?" he asked, with more curiosity than was perhaps excusable. "It looks for all the world like some sort of impressionistic valentine." Nancy, for one reckless moment, was tempted to say that it was, but temperate judgment prevailed.
All who have been in the field during our civil war know how long it took before they were able again to sleep in a bed. The Napoleonic soldiery describe how the warmth of the bed brought on the most frightful mental pictures; they saw burnt, frozen, and mutilated comrades and had to try to find rest on the floor, their nervous and their circulatory systems were excited to an intolerable degree.
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