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Page 103 - ... another, is incidental on unknown differences in their reproductive systems. There is no more reason to think that species have been specially endowed with various degrees of sterility to prevent...
Page 169 - A few years ago magnetism was to us an occult power, affecting only a few bodies, now it is found to influence all bodies, and to possess the most intimate relations with electricity, heat, chemical action, light, crystallization, and through it, with the forces concerned in cohesion; and we may, in the present state of things, well feel urged to continue in our labours, encouraged by the hope of bringing it into a bond of union with gravity itself.
Page 232 - ... hydro-carbons. The water, which is purposely introduced at the bottom of the arrangement, is first vaporized by the heat, and then decomposed by the ignited fuel and rearranged as hydrogen and carbonic oxide ; and only the ashes of the coal are removed as solid matter from the chamber at the bottom of the fire-bars.
Page 338 - ... first indication of choking of the worm is a partial or entire stoppage of the stream of liquid which normally flows steadily from the end of the worm into the retort. Any interruption or unsteadiness of this flow would indicate too rapid ebullition. As a rule, other things being equal, the greater the difference between the temperature of the bath and that of the retort, the slower the products will come off, and the more effectual will be the separation. I think it possible, however, that the...
Page 24 - Volcanoes, insisted on the important part which water plays in an eruption, when intimately mixed up with the component materials of lava, aiding, as he supposed, in giving mobility to the more solid materials of the fluid mass. But when advocating this igneo-aqueous theory, he never dreamt of impugning the Huttonian doctrine as to the intensity of heat which the production of the unstratified rocks, those of the plutonic class especially implies.
Page 233 - ... making an intensity of power which, unless moderated on purpose, would fuse furnace and all exposed to its action. Thus the regenerators are alternately heated and cooled by the outgoing and entering gas and air, and the time for alternation is from half an hour to an hour, as observation may indicate.
Page 330 - F. = 80 °C.) ; it is evident, therefore, that any of the summary processes of rectification which are practised by distillers in the manufacture of alcoholic spirits, are applicable to the separation of benzole from the less volatile fluids of the naphtha. The method now to be described is, one which extracts nearly the whole of this spirituous hydrocarbon, by a very slight expenditure of time. The light coal naphtha (of which it is...
Page 361 - Altogether this one species includes three females or female organs and three sets of male organs, all as distinct from one another as if they belonged to different species; and if smaller functional differences are considered, there are five distinct sets of males. Two of the three hermaphrodites must co-exist, and pollen must be carried by insects reciprocally from one to the other, in order that either of the two should be fully fertile; but unless all three forms co-exist, two sets of stamens...
Page 15 - ... feet in diameter, and no less than 140 feet in height. All this matter is now quietly conveyed by a stream of limpid water, in an invisible form, to the Avon, and by the Avon to the sea ; but if, instead of being thus removed, it were deposited around the orifice of eruption, like the...
Page 232 - ... ie about halfway down it is a solid plate, and for the rest of the distance consists of strong horizontal plate bars where air enters ; the whole being at an inclination such as that which the side of a heap of...