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The great majority of city bred men, as well as all students, are prone to deleterious effects from too much sitting; and indeed there is anatomical evidence in the structure of the tissues, and especially the blood-vessels of the groins, that, at his best, man is not yet entirely adjusted to the upright position.
The valvular arrangements of the blood-vessels are unapproached by any artificial apparatus, and the arrangements for preventing friction are so perfect that two surfaces will play on each other for fourscore years or more and never once trouble their owner by catching or rubbing so as to be felt or heard.
"Even if the autopsy shows nothing, it doesn't prove that it was a natural death. Look!" On the back of the hand was a tiny, red, swollen mark. Dr. Leslie regarded it with pursed-up lips as though not knowing whether it was significant or not. "The tissues seemed to be thickly infiltrated with a reddish serum and the blood-vessels congested," he remarked slowly.
To be of any service the food must enter the blood; it must be absorbed. The efficient agents in absorption are the blood-vessels, the lacteals, and the lymphatics. The process through which the nutritious material is fitted to enter the blood, is called absorption. It is a process not confined, as we shall see, simply to the alimentary canal, but one that is going on in every tissue.
The rivers, you see, are the blood-vessels of the earth, and as these carry blue and red blood alternately, so our land has its Blue Nile and its Red Nile. The Blue Nile is poisonous like dark blood, and the Red is fertilising, life-giving, like red blood. So everything created has its counterpart above in heaven and below on earth, for all is one, and the Lord of all is One One and the Same."
Hence, likewise, to persons in a state of intoxication, this intercourse is extremely pernicious; because in such a state the increased circulation of the blood towards the head may be attended with dangerous consequences, such as bursting of blood-vessels, apoplexy, etc. The plethoric are particularly exposed to these dangers.
Pleasure causes dilatation of the blood-vessels; the circulation, and consequently all the functions of secretion and assimilation are facilitated; the face is suffused with color, the gastric juice and the saliva are perceptible as that healthy appetite and that watering of the mouth which invite us to supply fresh nourishment to the body; all the tissues work actively to expel their toxins, and to assimilate fresh nourishment; the enlarged lungs store up large quantities of oxygen, which burn up all refuse, leaving no trace of poisonous germs.
Brachiopods formed another of his classes; but these differ from the other Bivalves only in having a net-work of blood-vessels in the place of the free gills, and this is merely a complication of structure, not a difference in the general mode of execution, for their position and relation to the rest of the organization are exactly the same in both.
This cast may be compared to a bronze statue, representing merely the superficial form, and not the internal organisation; but there is another description of petrifaction by no means uncommon, and of a much more wonderful kind, which may be compared to certain anatomical models in wax, where not only the outward forms and features, but the nerves, blood-vessels, and other internal organs are also shown.
At first you imagine they are motes clogging the delicate blood-vessels of the retina; then you wonder if a distant host of falling meteors could have passed. Soon a larger, nearer mote appears; the moon and its craters are forgotten and with a thrill of delight you realise that they are birds living, flying birds of all earthly things typical of the most vital life!
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