Of the crystalline lens and cataract / by Bernard Edward Brodhurst.

  • Brodhurst, Bernard Edward, 1822-1900.
Date:
[1850]
Catalogue details

Licence: Public Domain Mark

Credit: Of the crystalline lens and cataract / by Bernard Edward Brodhurst. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    though nearly alUed to cither. With regard to it, Simon writes as follows :— With resiiect to the chemical composition of the lens, I find that, in ad- dition to albumen, it contains a substance closely resembling casein, to which I apply the term crys- tallin. I reduce the lens to a pulpy mass, stir it with water, and then heat the mixture to the boiling point: the albumen coagulates, while the crystalHn does not coagulate, but is entangled in the albumen. In order to separate them, I evaporate to dryness, pulverize the white residue, and boil it, first with ether in order to separate fat, and then with spirit of 915 as long as anything continues to be taken up. The albumen rapidly sinks fi^om the hot, clear, spirituous solution, and the supernatant fluid, which must be decanted from the sediment, soon begins to become turbid from the separation of numerous floc- culi of crystallin. I evaporate to a slight residue, and then precipitate the crystallin by strong al- cohol, in which it is only slightly soluble. The lac- tates and chloride of sodium remain dissolved in the alcohol. In this manner I analyzed the crystalhne lens of the ox and the horse. Anal. 158 Anal. ] 59 crystalline lens of ox. ditto of Iiorse. Water 65.7G2 60.000 Albumen 23.2S0 25.5.SI Crystal!'n 10.480 14.200 Fat 0.045 0.142 Extractive matter with chlo- ride of sodium aud lac- h 0.495 0.426 tates . . . /