An experimental enquiry into the effects of tonics, and other medicinal substances, on the cohesion of the animal fibre ... / Edited by Alexander Crawford.

  • Adair Crawford
Date:
1816
Catalogue details

Licence: Public Domain Mark

Credit: An experimental enquiry into the effects of tonics, and other medicinal substances, on the cohesion of the animal fibre ... / Edited by Alexander Crawford. Source: Wellcome Collection.

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    By the firmness of the fibre, I mean to ex¬ press the force with which it resists impression; by the elasticity, its power of resisting exten¬ sion, and of restoring itself when the extending cause, is removed; by its strength, the force which it is capable of exerting in opposition to such causes as tend to destroy the continuity of its parts. The first of these properties is known by the touch; the second, by the comparative ex¬ tensions which the fibres undergo, when they are stretched by equal small weights; and the third, or the strength of the fibre, is known by the weight which is required to break it. In the course of the following enquiry, it will be shown that there are many substances in nature, which have the power of variously increasing or diminishing the firmness, elas¬ ticity, and strength of the fibres, in living and in dead animals. Those substances which, diminish the firm¬ ness and elasticity of the fibre, I shall call relaxants; those which increase its elasticity, tonics; and those which increase its strength, corroborants. It is proper to observe, that in the living
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