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METHOD of manufacturing Isinglass, or fish glue; with

remarks by the Editor,

Page.

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USEFUL KNOWLEDGE.

JULY, 1810.

FORK

No. 1.

METHOD OF MANUFACTURING ISINGLASS.

THE following account of the manufactory of Isinglass is the only one ever published. It is the result of a journey to Russia, expressly undertaken to discover the process, and of numerous experiments upon British fish, by the late Humphrey Jackson, of London, and published by him in the Trans. Royal Soc. vol. 63.

THE secret of Isinglass rested a long time solely with the Russians, and made from the fish Huso,* or Isinglass Sturgeon; and its name in Greek signifies fish-glue, viz. ICHTHYOCOLLA. All authors who have hitherto delivered processes for making fish-glue, or Isinglass, have greatly mistaken both its constituent matter and preparation. To prove this assertion, it may not be improper to recite what a writer of the name of Pomet says on the subject, as he appears to be the principal author, whom the rest have copied. After describing the fish, he says, as to the manner of making the Isinglass, the sinewy parts of the fish are boiled in water till all of them be dissolved that will dissolve, then the gluey liquor is strained and set to cool. Being cold, the fat is carefully taken off, and the liquor itself is boiled to a juicy consistency, then cut to pieces and made into a twist, bent in form of a crescent, as commonly sold, then hung upon a string and carefully dried. From this account it might rationally be concluded that every species of fish, which contained gelatinous principles, would yield Isinglass; and this parity of

*i Accipenser Huso Lin. EDIT.

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