Some experiments on the changes which take place in the fixed principles of the egg during incubation.

  • Prout, William, 1785-1850.
Date:
1822
Catalogue details

Licence: Public Domain Mark

Credit: Some experiments on the changes which take place in the fixed principles of the egg during incubation. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

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    An egg, analyzed two days later, or on the 17th day of incubation, gave the following results : No. 3. Sulphuric Acid. Phospho- ric Acid. Chlorine. Potash, j Soda, and Caro, of Ditto. Lime, Mag- nesia, and Carb. of Ditto. Liquor amnii, mem- 1 branes, animal, i &c. - - J Grains. Grains. Grains. G ains. Grains. •34 1.70 .68 2.4,0 1.10 Yelk - - - .10 2.30 .30 .56 •75 •44 4.20 .98 2 96 1.83 At this period ossification, which, according to Haller and others, begins about the 7th day, has made some pro- gress. The yelk has parted with some of its phosphorus, which appears in the other principles of the egg ; this is par- ticularly observable in No. 3. The quantity of earthy matter has also increased, particularly in No. 3. Experiments on the egg at the end of the third week, or at the full period of incubation. At this period an egg has lost upon an average about 160 grains, on the supposition that its original weight was 1000 grains ; and the weights of the constituent principles of two eggs in their moist state and without boiling, were as follow : Residuum of albumen, membranes, &c. Animal - Yelk - Shell and loss - Grains. 295 555 1 167.7 247.7 Grains. 38.1 55.3-6 151.3 257.0 1000.0 1000.0