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Updated: May 7, 2025
The right one usually degenerates before or at hatching and is wholly absent in the week-old squab. In pigeons, Riddle thinks the "developmental energy" of the eggs is in an inverse ratio to their size. The last and largest eggs of the season develop least and produce most females. The second egg of a clutch is larger than the first, but develops less and the bird produced is shorter-lived.
The types discovered by comparative anatomy and developmental history must therefore agree."
It is necessary to reduce the physiological and developmental, and all the other processes of life, to terms of physical and chemical processes, and thus to reduce the living to the not living, and to derive the organic from the forces and substances of inanimate nature. The process of reduction does not stop even here.
And finally, highest of all, we must place our conduct as shown in written or printed language. This is a brief outline of our evolutionary and developmental ascent and of the increasing complexity and refinement of our social conduct. Tics. Interstate Medical Journal, January and February, 1915. In our motor adaptations we respond in one or more of these ways.
So much for the development of the higher Crustacea. A closer examination of the developmental history of the lower Crustacea is unnecessary after what has been said in general upon the historical significance of the young states, and the application of this which has just been made to the Malacostraca.
The difference between Professor Weismann and, we will say, Heringians consists in the fact that the first maintains the new germ-plasm when on the point of repeating its developmental processes to take practically no cognisance of anything that has happened to it since the last occasion on which it developed itself; while the latter maintain that offspring takes much the same kind of account of what has happened to it in the persons of its parents since the last occasion on which it developed itself, as people in ordinary life take things that happen to them.
The repetition, therefore, of its developmental stages by any offspring must be regarded as something which the embryo repeating them has already done once, in the person of one or other parent; and if once, then, as many times as there have been generations between any given embryo now repeating it, and the point in life from which we started say, for example, the amoeba.
But in one thing, I hope, I have succeeded, in convincing UNPREJUDICED readers, that Darwin's theory furnishes the key of intelligibility for the developmental history of the Crustacea, as for so many other facts inexplicable without it.
One explains the term "days" to mean long periods of time; the other accepts the word in its ordinary and most natural sense, and endeavours to eliminate the long course of developmental work made known to us by palaeontological science, and supposes all that to have been passed over in silence; and argues that a final preparation for the advent of the man Adam was made in a special work of six days.
For it needs little reflection to perceive that the most familiar facts of our experience and observation never fail to confirm the doctrine based by Weismann upon the revelations of the microscope when applied to the developmental processes of certain simple animal and vegetable forms.
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