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Updated: June 29, 2025
To the aquatic type his love of maritime adventure very readily assimilates him; and how far the suctorial is represented in his nature it is hardly necessary to say. As the corvidae, too, are found in every part of the earth almost the only one of the inferior animals which has been acknowledged as universal so do we find man.
In the paddles of the extinct gigantic sea-lizards, and in the mouths of certain suctorial crustaceans, the general pattern seems to have been thus to a certain extent obscured. There is another and equally curious branch of the present subject; namely, the comparison not of the same part in different members of a class, but of the different parts or organs in the same individual.
An outbreak of plague among men is often preceded by a very noticeable outbreak among rats. Rats dying of the plague have their blood filled with the plague bacillus. Fleas or other suctorial insects feeding on such rats take myriads of these bacilli into their stomach and get many on their proboscis. The fleas usually leave a rat as soon as it dies and of course seek some other source of food.
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