Experiments on the blood : with some remarks on its morbid appearances / by William Hewson.

  • William Hewson
Date:
1771
Catalogue details

Licence: Public Domain Mark

Credit: Experiments on the blood : with some remarks on its morbid appearances / by William Hewson. Source: Wellcome Collection.

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    Ifertim is in a great, and the crajjamentum in a fmall proportion, bleeding and dilating would be highly improper. As it is therefore fuppofed ufeful to at¬ tend to the proportions of thefe parts in many dis¬ orders, and even to take indications of cure from them, it has been an object with thofe who have made experiments on the blood, to determine the circumftances on which its more perfedt feparation into thefe two parts depends ; it being obvious, that till this be done, our inferences from their propor¬ tions will be liable to con-fid e-fable fallacies. Two of the lateft writers on this fubjedt agree, that if the blood* after being taken from a vein, be fet in a cold place, it will not eafily feparate, and that a moderate warmth is neceffary : this is a fadt that is evinced by daily experience. They likewife fay, that the heat fhould be lefs than that of the animal, or than 98° of Fahrenheit’s thermometer; and that if frefh blood be received into a cup, and that cup put into water heated to 98 °, it will not feparate; nay, they even fay, that it will not coagulate; but lis, I am perfuaded from experiments, is ill-founded. I f . . . . .» -it! '■ * « f ,'J 1 . ' “f' > i ’ i I / ! f . - j 1 _ I > I i 1 r .) i , i V i U / -U i } , - Experiment I. A tin-veffel containing water, was placed upon a lamp which kept the water in a heat that varied be¬ tween 100 and 105 degrees. In this water was placed a phial, containing blood that inftant taken from the arm of a perfon in health; the phial was previoufiy warmed, then filled, and corked to ex¬ clude air. In the fame water was placed a tea-cup iudf full of blood, juft taken from the fame perfon 5 a third
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