Volume 1

A treatise on the digestion of food / [George Fordyce].

  • George Fordyce
Date:
1791
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on the digestion of food / [George Fordyce]. Source: Wellcome Collection.

    30/230 page 12
    [ 12 ] mach is of different degrees of moifture or drynefs, the appearances are extremely dif-_ ferent. ‘The manner in which I have been able to get it moft diftinét, -was by placing a {mall portion of the interior part upon a {mall circular plate of ivory, with the fur- face outward and in view; this. fmall plate of ivory. was fixed in the centre of a circular ‘plate of glafs, which fitted the ftage of a compound microfcope, and a filver concave mirror was applied at the object end of the microfcope to reflect the light, as ufual in viewing opake bodies. When the furface was moderately moift, there appeared a number of fine thin’ membranes, crofling one another fo as to form a number of irre- gular cells; and the furfaces of each of thefe membranes were covered again by finer and fmaller membranes again crofling one another, fo as to form lefler and thallower cells, foas very much to increafe the inte- rior furface; and this appearance accords with what is feen by the naked eye, or a glafs of little magnifying power, and very much refembles a piece of pumice ftone broken,
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