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acid actions adaptation aggregate allied alterations Amphibia arise arrangement assimilation atoms become binary compounds birds body carbonic carbonic acid cause cells centres changes chemical colloids combination complex compounds connexion constituting continuous contrasts correspondence creatures crustaceans crystalloids Darwin definite degree differentiation direct displayed distinct divergence effects embryo environment equilibration ethereal waves evidence exhibit exist external facts Faunas fertilized germ functions further gamogenesis genesis greater groups growth habitats habitually heat Hence heterogeneity higher Hydrozoa hypothesis of evolution implies incident forces increase individuals inorganic kind less living mammals manifest mass ment modes modifications molecular mobility molluscs motion moving equilibrium multiplication muscles natural selection nitrogenous nutriment nutrition offspring organic matter oviparous ovum oxygen parent parthenogenesis peculiarity phenomena physiological units polype produced Protozoa races re-actions re-distribution relations result similarly special creations species stamens structure substances successive temperature tion tissues truth types undergo unlike variations Vertebrata vital
Page 263 - is a definite combination of heterogeneous changes, both simultaneous and successive, in correspondence with external coexistences and sequences.
Page 16 - Although chemically inert in the ordinary sense, colloids possess a compensating activity of their own, arising out of their physical properties. While the rigidity of the crystalline structure shuts out external impressions, the softness of the gelatinous colloid partakes of fluidity, and enables the colloid to become a medium for liquid diffusion, like water itself.
Page 175 - It is a corollary from that primordial truth which, as we have seen, underlies all other truths, that whatever amount of power an organism expends in any shape is the correlate and equivalent of a power that was taken into it from without.
Page 404 - ... existence of those animal species that actually exemplify it. To what natural laws or secondary causes the orderly succession and progression of such organic phenomena may have been committed, we, as yet, are ignorant.
Page 18 - The inquiry suggests itself whether the colloid molecule may not be constituted by the grouping together of a number of smaller crystalloid molecules, and whether the basis of colloidality may not really be this composite character of the molecule.
Page 61 - Life is a series of definite and successive changes, both of structure and composition, which take place within an individual without destroying its identity.
Page 65 - ... state. An inorganic body cannot be oxidized, without being at the same time changed in weight, colour, atomic arrangement, temperature, and electric condition. And in some...
Page 247 - Kentucky, are blind. In some of the crabs the foot-stalk for the eye remains, though the eye is gone ; — the stand for the telescope is there, though the telescope with its glasses has been lost. As it is difficult to imagine that eyes, though useless, could be in any way injurious to animals living in darkness, their loss may be attributed to disuse.