Specification of James Dewar : preserving blood for food.

  • James Dewar
Date:
1868
Catalogue details

Licence: Public Domain Mark

Credit: Specification of James Dewar : preserving blood for food. Source: Wellcome Collection.

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    Dewar's Improvements in Preserving Blood for Food. kept dry remain in a condition suitable for the food of man, and of horses, cattle, sheep, dogs, poultry, and the other lower animals for a certain length of time, and from experience I find that it can be so preserved for six weeks, but I use in preference, when I wish to preserve the blood for a considerable period, the following methods, viz*., I 5 either mix the fresh blood with an aqueous solution of sulphurous acid or with sulphurous acid in combination with an alkali in the form of a sulphite or bi-sulphite, and then mix such blood so treated with any of the vegetable substances before mentioned and submit the mixture to desiccation as before described; or I mix the fresh blood with the said 10 aqueous solution of sulphurous acid or with sulphurous acid in com¬ bination with an alkali in the form of a sulphite or bi-sulphite without mixing it with any other substance, and then either keep the blood so treated in a liquid state until required for use, or I desiccate it as before described and keep it dry. 25 In regard to the quantities of sulphurous acid and sulphites or bi-sulphites which I employ, I find that one ounce of the aqueous solution of sulphurous acid of the ordinary commercial strength, say of specific gravity F012, is sufficient for twelve ounces of fresh blood, and that one ounce of the sulphite or bi-sulphite suffices for the same 20 quantity, that is for twelve ounces of fresh blood. I find that horses and oxen most readily eat the preserved blood when boiled along with turnips and hay seed, which is a convenient form in which to give it them. For the use of man, the preserved blood can conveniently be made into biscuits, by mixing it with wheaten or other flour, or into 25 cakes by mixing it with oatmeal or other meal. It can conveniently be used in the form of soup, by mixing it with water and cooking it with vegetables, and otherwise in the manner usual in preparing soup. In witness whereof, I, the said James Dewar, have hereunto set m\ hand and seal, this Eighteenth day of August, in the year 30 of our Lord One thousand eight hundred and sixty-eight. JAMES DEWAR,, (l.s.) p . , , , „ LONDON: Punted by George Edward Eyre and William Spottiswoode, rimters to the Queen s most Excellent Majesty. 1868.
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