A critical and experimental essay on the circulation of the blood; especially as observed in the minute and capillary vessels of the Batrachia and of fishes / [Marshall Hall].

  • Hall, Marshall, 1790-1857
Date:
[1844]
Catalogue details

Licence: Public Domain Mark

Credit: A critical and experimental essay on the circulation of the blood; especially as observed in the minute and capillary vessels of the Batrachia and of fishes / [Marshall Hall]. Source: Wellcome Collection.

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    and again removed with precisely the same effects. T. he insensibility was so perfect that the eyes were not retracted on being touched. The recovery was prompt and complete. I repeated the experiment with diluted alcohol, with similar effects. The experiment was now made with a mixture of opium and water. It was long before it pro- duced any effect. At length, however, the circula- tion in the web ceased, and the animal became affected with complete tetanus. The same effect was produced more speedily on inducing the animal to swallow a few’ drops of the opiate solution. These effects of laudanum are precisely what were observed by Dr. Alston of Edinburgh more than a century ago. Dr. Alston relates his experi- ments in the following characteristic manner: In the physick garden at Holyvoodhouse (where all the Experiments on Frogs were made) I one evening put a big strong Paddock into a Pot of Water, wdieiem a small Quantity of Opium was dissolved; it soon appear’d to be uneasy, by making strong Efforts to get out of it, but in a short time it flag d or grew dull, making very little L