Proceedings of the Cambridge Philosophical Society: Mathematical and physical sciences, Volume 6

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Cambridge Philosophical Society, 1889 - Science

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Page 72 - For areas of moderate extent, it is doubtless true that no practical evil is likely to result from assuming the corresponding beds to be synchronous or strictly contemporaneous; and there are multitudes of accessory circumstances which may fully justify the assumption of such synchrony. But the moment the geologist has to deal with large areas, or with completely separated deposits, the mischief of confounding that " homotaxis " or * similarity of arrangement," which can be demonstrated, with " synchrony
Page 268 - ... the motion, which was passed. Mr. SHANKS moved a vote of thanks to the Council of the Institution, for their services during the past year, which was seconded by Mr. GARLAND, and passed. The CHAIRMAN then announced that the ballot papers had been opened by the Committee appointed for the purpose, and the following Officers and Members of Council were elected for the ensuing year. He observed that the Committee had reported that a number of the ballot papers sent in by the Members had to be rejected...
Page 28 - vesicular vessels" of the onion, by SH Vines, MA Christ's, and AB Rendle, St. John's. In investigating the vesicular organs with the object of determining whether or not the transverse walls are perforated so as to place the cavities of successive segments in communication, the authors observed that, in the quiescent winter condition of the bulb, there are patches of callus — easily made conspicuous by staining with corallin — on the transverse walls. From this they infer that the transverse...
Page 72 - There seems, then, no escape from the admission that neither physical geology nor palaeontology possesses any method by which the absolute synchronism of two strata can be demonstrated. All that geology can prove is local order of succession.
Page 27 - ... morphological features may be added to those generally stated as appertaining to the group — coelom inconspicuous, body cavity consisting entirely of vascular spaces. In Vertebrates and most Annelids, on the other hand, the parts in question are arranged as follows: — Body cavity entirely coelomic; vascular spaces broken up into a complicated system of channels (arteries, veins, capillaries).
Page 30 - Passijlora fa'liJa, placed it, in his opinion, beyond doubt that the function of the extra floral nectaries of the two orders is to attract certain insects — probably ants — which are of service to the plant in protecting it from the attacks of other and harmful insects, such as caterpillars, which are accustomed to creep up the narrow stem for the purpose of devouring or otherwise injuring the young growing shoots. As regards the fertilisation of...
Page 18 - If the liquid is saturated with gas at all depths, the mass of the gas dissolved by a given quantity of it will be greater at greater depths on account of the increased pressure there : and if, on the pressure being relieved from that required for saturation, vesicles of gas are separated from it, these must be subject to the liquid pressure.
Page 125 - AVhilst doing this care must, be taken that the collector does not himself spread the disease by carrying the refuse loosely. Rotation of crops, or, when this is impossible, deep trenching, would lessen the chance of the disease appearing. 7. Diseased plants may be treated with a mixture of powdered sulphur and freshly burnt quicklime sprinkled by hand or by bellows; or they may be washed or sprayed with a weak solution of iron sulphate (green vitriol). In both cases the- fungus is destroyed without...
Page 219 - Perich<eta from New Zealand. CAMBRIDGE. Philosophical Society, May 21.— Mr. JW Clark, President, in the chair. — On solution and crystallization, by Prof. Liveing. When a substance passes from a state of solution into the solid state, the new arrangement of the matter must be such that the entropy of the system is a maximum ; and, other things being the same, the surface energy of the newly- formed solid must be a minimum. If the surface tension be positive, that is tend to contract the surface,...
Page 363 - Strictly speaking m1 would be the integer next over the (in general) fractional value of m which satisfies the above equation, but it is easy to see that in passing to the limit we may suppose the equation satisfied exactly. Within the specified limits of that portion of our series which it suffices to consider, we see at once that mI may be written for m when we are dealing with any finite...

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