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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    Provisional Dewar's Improvements in Preserving Blood for Food. lower animals. To effect this object I either subject the blood of newly slaughtered animals to careful desiccation by exposure to a temperature between sixty and one hundred and forty degrees of Fahrenheit so as to expel the moisture while preserving and concentrating the nutritions qualities of the blood. Or I mix such blood with meal, flour, seeds, 5 husks of seeds, grain, or other farinaceous matter or roots either in their natural state or dried and chopped up, ground down or pulverized (for the food of animals other than man I sometimes add powdered oil cake to the mass). I next subject the mixture to careful desic¬ cation as before described. Blood when treated as above specified will, 10 if carefully kept dry remain in a condition suitable for the food of man and of horses, cattle, sheep, poultry, and other lower animals for a length of time, but I use in preference when I wish to preserve the blood for a considerable period, the following methods, vizh,—I either mix the fresh blood with an aqueous solution of sulphurous acid, or 15 with sulphurous acid in combination with an alkali in the form of a sulphite and then mix the blood so treated with any of the solid sub¬ stances before mentioned and submit the mixture to desiccation as before described; or I mix the fresh blood with the said aqueous solution of sulphurous acid alone, or with sulphurous acid in combination with 20 an alkali in the form of a sulphite without mixing it with any solid substance, and then keep the blood so treated either in a liquid state until required for use, or I desiccate it as before described and keep it dry. SPECIFICATION in pursuance of the conditions of the Letters Patent, 25 filed by the said James Dewar in the Great Seal Patent Office on the 20th August 1868. TO ALL TO WHOM THESE PRESENTS SHALL COME, I, James Dewar, Doctor of Medicine, residing in Kirkcaldy, in the County of Fife, North Britain, send greeting. 30 WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters Patent, bearing date the Third day of March, in the year of our Lord One thousand eight hundred and sixty-eight, in the Thirty- first year of Her reign, did, for Herself, Her heirs and successors, give and grant unto me, the said James Dewar, Her special licence that I, 35