The evolution theory . y their habit of concealing the eggs in a specialbrood-chamber. This is the case not only in the summer eggs, to which nourishment is conveyed in the brood-chamber from the blood of the mother (), but also in the winter or lasting eggs,which receive within the chamber a pro-tecting covering (the shell or ephippium). In almost all the Daphnids the winter egg-develops into a perfect animal just like thatto which the summer egg gives rise, althouglinella. it, summer ovum, with it no longer receives any nourishment after itan oil-globule (0.). 5, winter passes into the
The evolution theory . y their habit of concealing the eggs in a specialbrood-chamber. This is the case not only in the summer eggs, to which nourishment is conveyed in the brood-chamber from the blood of the mother (), but also in the winter or lasting eggs,which receive within the chamber a pro-tecting covering (the shell or ephippium). In almost all the Daphnids the winter egg-develops into a perfect animal just like thatto which the summer egg gives rise, althouglinella. it, summer ovum, with it no longer receives any nourishment after itan oil-globule (0.). 5, winter passes into the brood-chamber. But it receives a larger supply of yolk on this account, sothat the nutritive provision within the egg is sufficient to develop theperfect animal. There is only one exception to this, and it is of specialtheoretical interest, because it shows more plainly than any otherfact that the greater or less degree of condensation in the ontogenydepends upon the combined effect of the external conditions of
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Keywords: ., bookauthorthomsonj, bookcentury1900, bookdecade1900, bookyear1904
