Philosophical Transactions of the Royal Society of London, Volumen 103W. Bowyer and J. Nichols for Lockyer Davis, printer to the Royal Society, 1813 |
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Página 29
... tory . Such alterations in this part of the calculation may easily be made in future , as the advanced state of the science may require . Observations as given by the Instrument . Position of the of the Summer Solstice . 29.
... tory . Such alterations in this part of the calculation may easily be made in future , as the advanced state of the science may require . Observations as given by the Instrument . Position of the of the Summer Solstice . 29.
Página 32
... requiring its assistance , that the recovery of distant vision is rendered afterwards extremely difficult , if not ... require him to have a tolerably correct view of distant objects ; as of the movements of the fugleman in exercise ...
... requiring its assistance , that the recovery of distant vision is rendered afterwards extremely difficult , if not ... require him to have a tolerably correct view of distant objects ; as of the movements of the fugleman in exercise ...
Página 34
... requires . * Although near sightedness is in general gradual in its pro- gress , instances occasionally occur of its existence , in a con- siderable degree , even in children ; in whom it is sometimes discovered almost as soon as they ...
... requires . * Although near sightedness is in general gradual in its pro- gress , instances occasionally occur of its existence , in a con- siderable degree , even in children ; in whom it is sometimes discovered almost as soon as they ...
Página 43
... require for this purpose the aid of convex glasses , they usually retain the sight of those that are distant as well as when they were young . Instances , however , are not wanting of persons advanced in life , who require the aid of ...
... require for this purpose the aid of convex glasses , they usually retain the sight of those that are distant as well as when they were young . Instances , however , are not wanting of persons advanced in life , who require the aid of ...
Página 61
... require de- monstration , their existence is by no means necessary to any hypothesis here advanced , which requires merely mathemati- cal points endued with powers of attraction and repulsion equally on all sides , so that their extent ...
... require de- monstration , their existence is by no means necessary to any hypothesis here advanced , which requires merely mathemati- cal points endued with powers of attraction and repulsion equally on all sides , so that their extent ...
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Página 90 - ... and essential peculiarities of both. Frequent instances have happened where common ewes have had twins by Ancon rams, when one exhibited the complete marks and features of the ewe, the other of the ram. The contrast has been rendered singularly striking, when one short-legged and one long-legged lamb, produced at a birth, have been seen sucking the dam at the same iirae."—Philosophical Transactions, 1813, Pt.
Página 90 - The increase of a common ewe, impregnated by an ancon lara, follows entirely the one or the other, without blending any of the distinguishing and essential peculiarities of both. " Frequent instances have happened where common ewes have had twins by ancon rams, when one exhibited the complete marks and features of the ewe ; the other of the ram. The contrast has been rendered singularly striking when one s.hortlegged and one long-legged lamb, produced at a birth,, have been seen sucking the dam at...
Página 280 - From the general tenour of the results that I have stated, it appears reasonable to conclude that there exists in the fluoric compounds a peculiar substance, possessed of strong attractions for metallic bodies and hydrogen...
Página 74 - ... the water in the other ball, though at the distance of two or three feet, will be frozen solid in the course of a very few minutes. The vapour contained in the empty ball is condensed by the common operation of cold, and the vacuum produced by this condensation gives opportunity for a fresh quantity to arise from the opposite ball, with proportional reduction of its temperature.
Página 272 - the experiment of electrising pure liquid fluoric acid with considerable interest, as it seemed to offer the most probable method of ascertaining its real nature; but considerable difficulties occurred in executing the process. The liquid fluoric acid immediately destroys glass, and all animal and vo'.retable substances; it acts on all bodies containing metallic oxides; and I know of no substances which are not rapidly dissolved or decomposed by it, except metals, charcoal, phosphorus, sulphur,...
Página 50 - That instances are not uncommon in which persons far advanced in life (viz. between eighty and ninety), whose eyes have been accustomed for a long time to the use of deeply convex glasses, when they have read or written, have ceased to derive benefit from these glasses, and they have become able, without any assistance, to see both near and distant objects almost as well as when they were young. Although it be not easy to ascertain the cause of this amended vision, it seems not improbable that it...
Página 90 - Ancon sheep of quite modern origin have been observed to keep together, separating themselves from the rest of the flock when put into enclosures with other sheep.
Página 54 - When a number of similar balls are pressed together in the same plane, they form equilateral triangles with each other; and if balls so placed were cemented together and afterwards broken asunder, the straight lines in which they would be disposed to separate, would form angles of 60° with each other.
Página 110 - All this is exactly true, and to be accounted for by one single circumstance; namely, the habit of looking at near objects. Children born with eyes which are capable of adjusting themselves to the most distant objects, gradually lose that power soon after they begin to read and write; those who are most addicted to study become...
Página 89 - Colonel Humphreys' statements are exceedingly explicit on this point : — "When an Ancon ewe is impregnated by a common ram, the increase resembles wholly either the ewe or the ram. The increase of the common ewe impregnated by an Ancon ram follows entirely the one or the other, without blending any of the distinguishing and essential peculiarities of both. Frequent instances have happened where common ewes have had twins by Ancon rams, when one exhibited the complete marks and features of the...