Quantitative estimation of urine : new system of rapid analysis, for medical men and pharmacists : acidity, urea, sugar, total urates, albumen, and colour / by J. Barker Smith.

  • Smith, John Barker.
Date:
1897
Catalogue details

Licence: Public Domain Mark

Credit: Quantitative estimation of urine : new system of rapid analysis, for medical men and pharmacists : acidity, urea, sugar, total urates, albumen, and colour / by J. Barker Smith. 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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    •centims. Such a solution is alterable and must be made almost daily. Fifty centims of the acid perman- ganate constitute a Norme, used invariably for record- ing. Ten centims contain a Subnorme, used almost invariably for all experiments. It is also quite practi- cable to use a tenth norme of five centims. Method.—Measure a subnorme into] a two ounce flask. Fill a ten or five centim pipette with the solu- tion to be oxidised. Take the flaskjbetween the finger and thumb of the left hand and the pipette in the right hand. Shake the flask gently and continuously whilst the solution from the pipette is delivered regularly in running drops nntil the last trace of pink shall have disappeared and the contents of the flask become as limpid as water. The experiment ought not to occupy more than thirty seconds, and should be practised until we are able toj repeat experiments exactly, to a drop or two. Milk is a very convenient article to use for practice. Five centims of milk are diluted with water to twenty-five [[centims, the sub- norme used; no calculation is required. We'shall find 1'2 centims of milk to decolourise the] norme, i.e., the same quantity of the diluted milk the kubnorme. One such experiment, moreover, allows usItoj instantly fix the albuminoid percentage of milk, for sugar and fat do not react. Again, we may proceed .in the same way, first bringing up our subnorme to boiling point over a small spirit lamp ; we shall now find that a smaller but regular quantity of oxidisable solutions will decolourise. The results of these two experiments expressed in centims, give us an expression of oxidation ■capacity, a mark of integrity for all [oxidisable sub- stances, e.g, Expressions of Oxidation Capacity. Cows’ milk T2—‘5 | Woman’s milk'3-3—*8 Ooat’s milk 1*5—’5 | Asses’ milk . .^2,5—*6
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