On the analysis of the blood and urine, in health and disease. With directions for the analysis of urinary calculi / [George Owen Rees].

  • George Owen Rees
Date:
1836
Catalogue details

Licence: Public Domain Mark

Credit: On the analysis of the blood and urine, in health and disease. With directions for the analysis of urinary calculi / [George Owen Rees]. Source: Wellcome Collection.

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    i) removed, before they can produce the same effect, of precisely balancing the sand. By this method all that is wanted in the balance is a suitable degree of delicacy. The necessity for an equality of length in the scale-arms (which is very difficult to procure) is thus obviated, though it is absolutely necessary to the perfect determination of weight by the common method. The weight of fluids for analysis may be taken by two methods, viz. by balancing them in a bottle whose weight has been ascertained previously ;. or by weighing the vessel and fluid together, and then noting the diminution of weight which occurs, when the fluid for analysis is poured out. ‘The former method possesses the advantage of yielding a fixed quantity; for we can pour into the weighed vessel, exactly the weight of fluid we wish: but it is necessary always to wash out the weighing vessel with dis- tilled water * after the weighed fluid is poured out, in order to remove the adherent portions in the bottle, which, of course, were taken into ac- count when the weight was ascertained. By * These washings must, of course, be added to the fluid for analysis, and evaporated with it in pursuing the analysis. B 3