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By the last of the fifth month the weight has increased to one pound and the length to eight inches. Active foetal movements begin, that is, the foetus begins to move around and not lie quietly as before. This is what is usually spoken of as "feeling life," or as "quickening."
And this is no doubt true, but it by no means follows that the particular order and harmony observed among them should be that which we see. Surely the stripes of dun horses, and the teeth of the foetal Balæna, are not explained by the "existence of general laws of Nature." Mr. Darwin endeavours to explain the exact order of organic nature which exists; not the mere fact that there is some order.
Hegar has described an interesting case showing an association, of foetal origin, between sexual anomaly and abnormal hairness. In this case a girl of 16 had a uterus duplex, an infantile pelvis, very slight menstruation and undeveloped breasts.
In consequence of this coalescence, a whole piece of the lining of the womb comes away at birth with the foetal membrane that is interlaced with it. All the higher Placentals that have this decidua are classed together as the "Deciduates." The tearing away of the decidua at birth naturally causes the mother to lose a quantity of blood, which does not happen in the Indecidua.
Rocks: 1. Gneiss and Mica Slate system Foetal: 1st month, that of an avertebrated animal; Clay Slate and Grawacke system Foetal: 1st month, that of an avertebrated animal; Silurian system Foetal: 1st month, that of an avertebrated animal; Silurian system Foetal: 1st month, that of an avertebrated animal; Silurian system Foetal: 1st month, that of an avertebrated animal;
And this is no doubt true, but it by no means follows that the particular order and harmony observed among them should be that which we see. Surely the stripes of dun horses, and the teeth of the foetal 'Balaena', are not explained by the "existence of general laws of Nature." Mr.
Darwin's hypothesis, and see reason for believing that the whalebone whale and the whale with teeth in its mouth both sprang from a whale that had teeth, and that the teeth of the foetal whale are merely remnants recollections, if we may so say of the extinct whale.
It was conceived in dread and in bitterness of spirit. Every stage of its foetal development is watched with feeling of settled repugnance. In every step of its ante-natal progress the child meets only with grief and indignation in the mother. She would crush out its life, if she could. She loathed its conception; she loathed it in every stage of its ante-natal development.
The duck needs twenty-five days, the turkey twenty-seven, the peacock thirty-one, the swan forty-two, and the cassowary sixty-five. The smallest bird, the humming-bird, leaves the egg after twelve days. Hence the duration of individual development within the foetal membranes is, in the mammals and birds, clearly related to the absolute size of the body of the animal in question.
The greatest number is seen in the ostrich, which has eighteen caudal vertebrae in the foetal state, which are reduced to nine in the adult bird, many of them having been anchylosed together. Professor Owen therefore considers the tail of the Archaeopteryx as exemplifying the persistency of what is now an embryonic character.
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