An experimental inquiry into the nutrition of animal tissues / by William Marcet.

  • Marcet, W. (William), 1828-1900.
Date:
1874
Catalogue details

Licence: Public Domain Mark

Credit: An experimental inquiry into the nutrition of animal tissues / by William Marcet. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    Found by dialysis. ! Colloid or Non-diffusible Crystalloid or diffusible {KSLieo“o Phosphoric acid . . 0'022 3-261 0-504 In tliis experiment only 4*3 of albuminous waste (crys- talloid) in 100 parts had failed to pass through the septum of a dialyzer after 36 hours; while 5 per cent, more phos- phoric acid than was found as waste had passed through the septum of the dialyzer after the same lapse of time; this small proportion of phosphoric acid probably consisted of some of the so-called nutritive phosphoric acid, which not being possessed of such very undiffu sable properties as albumen, had traversed the dialyzer’s diaphragm. The phosphoric acid left in the dialyzer is too low, which bears out this explanation. Of course the number 0-022 of colloid phosphoric acid found by dialysis will hardly compare chem- ically with 0-032—the phosphoric acid colloid theoretical; but when the difficulty of the work, and the uncertainty of quantitative analysis carried on by means of dialysis are taken into consideration, the nearness of these two numbers must carry much weight towards the object I have in view. I should be induced to think that the nitrogenised sub- stances present, besides albumen, undergo gradually the crystalloid metamorphosis, which would account for small quantities of these substances failing to pass through the diaphragm of a dialyzer after twenty-four or thirty-six hours. It must be borne in mind, however, that the method of analysis by means of a dialyzer can only be considered as yielding approximate results. It follows from these experiments that the direct method of analysis—that which might be considered as yielding conclusions independent of theory, but which un- 1 This albumen is considered as strictly undiffusablo, and is entered in the proportion obtained by coagulation in the oxtract.