Excerpt from General Zoology, Vol. 4: Pisces
The general description both of the external and internal parts of Fishes, considered as a distinct tribe of animals, cannot be better detailed than in the works of the ingenious Dr. Monro, who observes that these animals have neither anterior nor posterior extremities, as quadrupeds and birds, their progression being performed in a different method. For this purpose they are provided with machines, properly consisting of a great number of elastic beams, connected to one another by firm membranes, and with a tail of similar texture. Their spine is moveable towards the posterior part, and the strongest muscles of their body are inserted there.
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