Habit and Intelligence in Their Connexion with the Laws of Matter and Force: a Series of Scientific Essays, Volum 1

Macmillan and Company, 1869

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Pàgina 260 - In my possession are two little embryos in spirit, whose names I have omitted to attach, and at present I am quite unable to say to what class they belong. They may be lizards or small birds, or very young mammalia, BO complete is the similarity in the mode of formation of the head and trunk in these animals.
Pàgina 313 - ... been useful to its possessor. Nor can I see any insuperable difficulty in further believing it possible that the membrane-connected fingers and fore-arm of the Galeopithecus might be greatly lengthened by natural selection ; and this, as far as the organs of flight are concerned, would convert it into a bat.
Pàgina 347 - ... all geological history showing continuity of life, must be limited within some such period of past time as one hundred million years.
Pàgina v - In the inner domain of ife we find two principles, which are, the author believes, coextensive with life and peculiar to it: these are Habit and Intelligence. He has made as full a statement as possible of the laws under which habits form, disappear, alter under altered circumstances, and vary spontaneously. He discusses that most important of all questions, whether intelligence is an ultimate fact, incapable of being resolved into...
Pàgina 311 - It is free intercrossing which chiefly gives uniformity, both under nature and under domestication, to the individuals of the same species or variety, when they live mingled together and are not exposed to any cause inducing excessive variability. The prevention of free crossing, and the intentional matching of individual animals, are the corner-stones of the breeder's art.
Pàgina 169 - ... inches. It was found that the greyhounds could not support the fatigues of a long chase in this attenuated atmosphere, and before they could come up with their prey, they lay down gasping for breath ; but these same animals have produced whelps which have grown up, and are not in the least degree incommoded by the want of density in the air, but run down the hares with as much ease as the fleetest of their race in this country.
Pàgina 195 - The most remarkable case is that observed by Dr. Godron, of Nancy. In 1861 that botanist observed, amongst a sowing of Datura tatula, the fruits of which are very spinous, a single individual of which the capsule was perfectly smooth. The seeds taken from this plant all furnished plants having the character of this individual. The fifth and sixth generations are now growing without exhibiting the least tendency to revert to the spinous form. More remarkable still, when crossed with the normal Datura...
Pàgina 103 - ... movement termed rotation or gyration, which is often seen in the contents of young " cells," and which, in some form or other, are probably of general occurrence, may depend on the contractility of protoplasm. They are said by those who have studied them to present a close resemblance to those of Amoeba and its allies. No one has yet shown a distinction of importance between protoplasm of the vegetable and sarcode of the animal kingdom. But there are other movements in plants, the cause of which...
Pàgina 317 - The higher the organization, whether of an entire organism or of a single organ, the greater is the number of the parts that co-operate, and the more perfect is their cooperation; and consequently the more necessity there is for corresponding variations to take place in all the cooperating parts at once, and the more useless will be any variation whatever unless it is accompanied by corresponding...

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