ttracted into the veins, returns their mba essay writing service numerous ramifications into the vena portæ the liver, and from this into the vena cava, and this in such wise that the blood in these veins has the same colour and consistency as in other veins, in opposition what many believe the fact. Nor indeed can imagine two contrary motions in any capillary system-the chyle upwards, the blood downwards. This could scarcely take place, and must held as altogether improbable. But not the thing rather arranged as the consummate providence nature? For were the chyle mingled with the blood, the crude with the digested, in help writing dissertation equal proportions, the result would not concoction, transmutation, and sanguification, but rather, and because they are severally active and passive, a mixture or combination, or medium compound the two, precisely as happens vhen vine mixed with water and syrup. But when a very minute quantity chyle mingled with a very large quantity circulating blood, a quantity chyle that bears no kind proportion the mass blood, the effect the same, as Aristotle says, as when a drop water added a cask wine, or the contrary the mass does not then present itself as a mixture, but still sensibly either wine or water.

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So in the mesenteric veins an animal not find either chyme or chyle and blood, blended together or distinct, but only blood, the same in colour, consistency, and other sensible properties, as appears in the veins generally. Still as there a certain though small and inappreciable portion chyle or incompletely digested matter mingled with the blood, nature has interposed the liver, in whose meandering channels suffers delay and undergoes additional change, lest arriving prematurely and crude at the heart, should who will write my paper for me oppress the vital principle. Hence in the embryo, there almost no use for the liver, but the umbilical vein passes directly through, a foramen or an anastomosis existing from the vena portæ.

The blood returns from the intestines the fætus, not through the liver, but into the umbilical vein mentioned, and flows at once into the heart, mingled with the natural blood which returning from the placenta whence also that in the development the fætus the liver one the organs that last formed. I have observed all the members perfectly marked out in the human fætus, even the genital organs, whilst there was yet scarcely any trace the liver.

And indeed at the period when all the parts, like the heart itself in the beginning, are still white, and except in the veins there no appearance redness, you shall see nothing in the seat the liver but a shapeless collection, as were, extravasated blood, which you might take for the effects a contusion or ruptured vein.

But in the incubated egg there are, as were, two umbilical vessels, one from the albumen passing entire through the liver, and going straight the heart another from the yelk, ending in the vena portæ for appears that the chick, in the first instance, entirely formed and nourished the white but the yelk after has come perfection and excluded from the shell for this part may still found in the abdomen the chick many days after its exclusion, and a substitute for the milk other animals. But these matters will better spoken in observations the formation the fret where many propositions, the following among the number, will discussed Wherefore this part formed or perfected first, that last, and the several members, what part the cause another? And there are many points essay rewriter having special reference the heart, such as wherefore does first acquire consistency, and appear possess life, motion, sense, before any other part the body perfected, as Aristotle says in his third book, De partibus Animalium? And also the blood, wherefore does precede all the rest? And in what way does possess the vital and animal principle, and show a tendency motion, and impelled hither and thither, the end for which the heart appears made? In the same way, in considering the pulse, why should one kind pulse indicate death, another recovery? And all the other kinds pulse, what may the cause and indication each? Likewise must consider the reason crises and natural critical discharges nutrition, and especially the distribution the nutriment and defluxions every description.

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Finally, reflecting every part medicine, physiology, pathology, semeiotics and therapeutics, when I see how many questions can answered, how many doubts resolved, how much obscurity illustrated the truth have declared, the light have made shine, I see a field such research paper online help vast extent in which I might proceed far, and expatiate videly, that this tractate would not only swell out into a volume, which was beyond purpose, but whole life, perchance, would In this place, therefore, and that indeed in a single chapter, I shall only endeavour refer the various particulars that present themselves in the dissection the heart and arteries their several uses and causes for I shall meet with many things which receive light from the truth I have been contending for, and which, in their turn, render more obvious. And indeed I would have confirmed and illustrated anatomical arguments above all others.

There but a single point which indeed would more correctly placed among our observations the use the spleen, but which will not altogether impertinent notice in this place incidentally. From the splenic branch which passes into the pancreas, and from the upper part, arise the posterior coronary, gastric, and gastroepiploic veins, all which are distributed upon the stomach in numerous branches and twigs, just as essay writing service reviews the mesenteric vessels are upon the intestines.

In a similar way, from the inferior part the same splenic branch, and along the back the colon and rectum proceed the hemorrhoidal veins.

The blood returning these veins, and bringing the cruder juices along with the one hand from the stomach, where they are thin, watery, and not yet perfectly chylified the other thick and more earthy, as derived from the fæces, but all poured into this splenic branch, are duly tempered the admixture contraries and nature mingling together these two kinds juices, difficult coction reason most opposite defects, and then diluting them with a large quantity warm blood, for see that the quantity returned from the spleen must very large when contemplate write my book report the size its arteries, they are brought the porta the liver in a state higher preparation. The defects either extreme are supplied and compensated this arrangement the veins. THE MOTION AND CIRCULATION OF THE BLOOD ARE CONFIRMED FROM THE PARTICULARS ApPARENT IN THE STRUCTURE OF THE HEART, AND THOSE THINGS WHICH DISSECTION UNFOLDS I DO not find the heart as a distinct and separate part in all animals some, indeed, such as the zoõphytes, have no heart this because these animals are coldest, one great bulk, soft texture, or a certain uniform sameness or simplicity structure among the number I may instance grubs and earth engendered putrefaction and not preserve their species. These have no heart, as not requiring any impeller nourishment into the extreme parts for they have bodies which are connate and homogeneous and without limbs that the contraction and relaxation the whole body they assume and expel, move and remove, the aliment. Oysters, mussels, sponges, and the whole genus zoõphytes or plant-animals have no heart, for the whole body used as a heart, or the whole animal a heart. In a great number ani mals,-almost the whole tribe insects-we cannot see distinctly reason the professional report writing services smallness the body still in bees, flies, hornets, and the like can perceive something pulsating with the help a magnifying-glass in pediculi, also, the same thing may seen, and as the body transparent, the passage the food through the intestines, like a black spot or stain, may perceived the aid But in some the pale-blooded and colder animals, as in snails, whelks, shrimps, and shell-fish, there a part which pulsates,-a kind vesicle or auricle without a heart,-slowly, indeed, and not perceived except in the warmer season the year. In these creatures this part contrived that shall pulsate, as there here a necessity for some impulse distribute the nutritive fluid, reason the variety organic parts, or the density the substance but the pulsations occur unfrequently, and sometimes in consequence the cold not at all, an arrangement the best adapted them as being a doubtful nature, that sometimes they appear live, sometimes die sometimes they show the vitality an animal, sometimes a vegetable.

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