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alburnum alkali ammonia animal appears ascertained bark bodies carbonic acid cavity Charles Hatchett chemical Chenevix coal colour combined Communicated compound consists contained copper corundum crystals Davy deduced degree described diameter dissolved distance effect electricity equal Everard Home examined experiments F.R.S. Read fluid former grains Hatchett heat Herschel hitherto Humphry Davy hydrogen hyperoxygenized muriate inches inferred investigation iron Knight light lime magnesia matter means mercury metals motion muriatic acid muscles nature nearly nitric acid observed obtained oxalic oxalic acid oxide oxygen oxymuriatic paper Phil platina portion potash potassium precipitate produced proportion quantity rays Read February Read June refraction resin salt similar Sir Joseph Banks soda solar solution species specific gravity stars stomach substance sulphate sulphur sulphuret surface tannin temperature Thomas Andrew Knight tion Trans tube various vegetable velocity vessels William Herschel William Hyde Wollaston
Page 35 - When a ray of light passes from one medium to another, it is refracted so that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocities in the two media.
Page 250 - It is very natural to suppose, that the repellent and attractive energies are communicated from one particle to another particle of the same kind, so as to establish a conducting chain in the fluid ; and that the locomotion takes place in consequence ; and that this is really the case seems to be shown by many facts.
Page 388 - On some Physiological Researches respecting the Influence of the Brain on the action of the Heart, and on the Generation of Animal Heat," for which a Copley medal, " the highest honour the Society has to bestow,
Page xiii - Lecture ; an Account of some new analytical Researches on the Nature of certain Bodies, particularly the Alkalies, Phosphorus, Sulphur, Carbonaceous Matter, and the Acids hitherto undecompounded ; with some general Observations on Chemical Theory.
Page 279 - ... the opinion of their formation independently of the presence of this substance. The combustible bases of the fixed alkalies seem to be repelled as other combustible substances, by positively electrified...
Page 92 - wherever two portions of the same light arrive at the eye by different routes, either exactly or very nearly in the same direction, the light becomes most intense when the difference of the routes is any multiple of a certain length, and least intense in the intermediate state of the interfering portions; and this length is different for light of different colours.
Page 294 - ... to be passed through them becomes less. The burners, where the gas is consumed, are connected with the above mains, by short tubes, each of which is furnished with a cock to regulate the admission of the gas to each burner, and to shut it totally off when requisite.
Page 218 - IT can scarcely have escaped the notice of the most inattentive observer of vegetation, that in whatever position a seed is placed to germinate, its radicle invariably makes an effort to descend towards the centre of the earth, whilst the elongated germen takes a precisely opposite direction ; and it has been proved by Du HAMEL* that if a seed, during its germination, be frequently inverted, the points both of the radicle and germen will return to the first direction. Some naturalists have supposed...
Page 385 - The Bakerian Lecture, on some of the Combinations of Oxymuriatic Gas and Oxygen, and on the Chemical Relations of these Principles to inflammable Bodies.
Page 271 - Observations on the nature of the new celestial body discovered by Dr. Olbers ; and of the Comet which was expected to appear in July last, in its return from the Sun. By William Herschel, LL.D., FRS— Phil. Trans., abr. A Narrative of the proceedings on board His Majesty's ship