Containing book II. Positive science

Longmans, Green, 1898
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Σελίδα 178 - The total energy of any material system is a quantity which can neither be increased nor diminished by any action between the parts of the system, though it may be transformed into any of the forms of which energy is susceptible...
Σελίδα 272 - I believe that animals have descended from at most only four or five progenitors, and plants from an equal or lesser number. Analogy would lead me one step further, namely, to the belief that all animals and plants have descended from some one prototype. But analogy may be a deceitful guide.
Σελίδα 172 - Change of motion is proportional to the impressed force, and takes place in the direction of the straight line in which the force acts.
Σελίδα 272 - We see this even in so trifling a fact as that the same poison often similarly affects plants and animals; or that the poison secreted by the gall-fly produces monstrous growths on the wild rose or oak-tree.
Σελίδα 138 - The vis insita, or innate force of matter, is a power of resisting, by which every body, as much as in it lies, continues in its present state, whether it be of rest, or of moving uniformly forwards in a right line.
Σελίδα 188 - On the other hand, those who imagined aethers in order to explain phenomena could not specify the nature of the motion of these media, and could not prove that the media, as imagined by them, would produce the effects they were meant to explain. The only aether which has survived is that which was invented by Huygens to explain the propagation of light. The evidence for the existence of the luminiferous...
Σελίδα 171 - The mutual action between two portions of matter receives different names according to the aspect under which it is studied, and this aspect depends on the extent of the material system which forms the subject of our attention. " If we take into account the whole phenomenon of the action between two portions of matter, we call it Stress. This stress, according to the mode in which it acts, may be described as Attraction, Repulsion, Tension, Pressure,
Σελίδα 189 - WHATEVER difficulties we may have in forming a consistent idea of the constitution of the ether, there can be no doubt that the interplanetary and interstellar spaces are not empty, but are occupied by a material substance or body which is certainly the largest and probably the most uniform body of which we have any knowledge.
Σελίδα 172 - Reaction is always equal and opposite to action ; that is to say, the actions of two bodies upon each other are always equal and directly opposite.
Σελίδα 237 - ... beings, and in which he institutes a broad contrast between the affinities which unite the elements of organic and inorganic compounds. Thus: " Chemical substances," says Miiller, " are regulated by the intrinsic properties and the elective affinity of the substances uniting to form them. In organic bodies, on the contrary, the power which induces, and maintains, the combination of their elements, does not consist in the intrinsic properties of those elements, but in something else, which not...

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