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Credit
The direct action of atropine, homatropine, hyoscine, hyoscyamine, and daturine on the heart of the dog, terrapin, and frog / by H.G. Beyer. Public Domain Mark. Source: Wellcome Collection.
Provider
This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.