Excerpt from Zoological Lectures, Vol. 2: Delivered at the Royal Institution in the Years 1806 and 1807
The blood of the Amphibia is always far less warm than that of quadrupeds and birds 3 for which reason they are often distinguished by the title of cold-blooded animals: in, this particular they re semble fishes, which are also, comparatively Speak ing, cold-blooded animals.
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