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Whence do they re-appear? Do they, too, take a "summer sleep," like the reptiles, molluscs, and tank fishes? or may they, like the Rotifera, be dried up and preserved for an indefinite period, resuming their vital activity on the mere recurrence of moisture?
In Corixæ the posterior wings, which lie under the hard and horny anterior wings, are a little shorter than the anterior wings; they are not folded up on themselves and are not so delicate and transparent as the wings of the beetle. Such small creatures as Daphnia pulex, Cyclops quadricornis and Rotifera should be introduced into ponds.
The acrita were the first forms of animal life upon earth, the starting point of that great branch of organization. The polypi vaginati, in the crustaceous covering of the living mass, and their more or less articulated structure, represent the annulosa. In the radiated forms of the rotifera, and the simple structure of the polypi rudes, we are reminded of the radiata.
The vessel which he placed near the apparatus contained on the following day Vibriones and Monads, to which were soon added larger Polygastric Infusoria, and afterwards Rotifera." pp. 32, 33. For readers who are not familiar with these subjects, it may be well to mention, that the weight of authority is decidedly against this doctrine of spontaneous generation.
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