The Popular Science Review: A Quarterly Miscellany of Entertaining and Instructive Articles on Scientific Subjects, Volumen8James Samuelson, Henry Lawson, William Sweetland Dallas Robert Hardwicke, 1869 |
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Términos y frases comunes
Academy acid ammonia animal anther anther cells appears Ascidian astronomers basidia body British carbonic carbonic acid cave Cave Lion centre cerebellum chemical Coccoliths colour comet compound compound eye Comptes-Rendus contains cornea cylinder described distance earth examined exhibited existence experiments fact feet filaments flakes fossil Geological gills give glass heat Herr Huxley Hyæna hydrogen Hydrozoa hymenium inches infusoria insect interesting iron lens light lines liquid lower Mars mass matter means metal Microscopical minute motion mycelium nature nearly nerve object observations obtained organs paper pass peculiar phenomena photographs pigment pileus plants plates pollen portion presbyopia present prism produced Professor rays recently remarkable retina rings Royal says seen side Society solar solution species specimens spectroscope spectrum spores stamens stars stigma structure substance surface telescope temperature tion Transit of Venus tube vapour vertebrate zoophyte
Pasajes populares
Página 411 - BIBLE ANIMALS ; being a Description of every Living Creature mentioned in the Scriptures, from the Ape to the Coral.
Página 174 - The POLAR WORLD; a Popular Description of Man and Nature in the Arctic and Antarctic Regions of the Globe. By Dr.
Página 7 - Having remarked how thin a stratum of air is displaced beneath the wings of a bird in rapid flight, it follows that in order to obtain the necessary length of plane for supporting heavy weights, the surfaces may be superposed, or placed in parallel rows, with an interval between them. A dozen pelicans may fly one above the other without mutual impediment, as if framed together ; and it is thus shown how two hundredweight may be supported in a transverse distance of only ten feet.
Página 237 - It has often been maintained on chemical grounds that hydrogen gas is the vapour of a highly volatile metal. The idea forces itself upon the mind that palladium with its occluded hydrogen is simply an alloy of this volatile metal, in which the volatility of the one element is restrained by its union with the other, and which owes its metallic aspect equally to both constituents.
Página 425 - Every fully-developed plant, whether of wheat, oats, or barley, presents an ear superior in productive power to any of the rest on that plant. 2. Every such plant contains one grain, which upon trial proves more productive than any other.
Página 218 - The palladium wire had, in consequence, hydrogen carried to its surface for a period of one and a half hour. A longer exposure was found not to add sensibly to the charge of hydrogen acquired by the wire. The wire was again measured and the increase in length noted. Finally the wire, being dried with a cloth, was divided at the marks, and the charged portion heated in a long narrow glass tube kept vacuous by a Sprengel aspirator. The whole occluded hydrogen was thus collected and measured; its volume...
Página 276 - brain" fever, he describes the powers acquired by the soul before dissolution in the following remarkable words: "Every sense u pure, the intellect acute, the gnostic powers prophetic; for they prognosticate to themselves in the first place their own departure from life ; then they foretell what will afterwards take place to those present, who fancy sometimes that they are delirious : but these persons wonder at the result of what has been said.
Página 291 - HALF-HOURS WITH THE STARS: a Plain and Easy Guide to the Knowledge of the Constellations. Showing in 12 Maps the position oi the principal Star-Groups night after night throughout the year. With Introduction and a separate Explanation of each Map. True for every Year.
Página 218 - The wire was twisted into a loop at each end, and the mark made near each loop. The loops were varnished, so as to limit absorption of gas by the wire to the measured length between the two marks. To straighten the wire, one loop was fixed, and the other connected with a string passing over a pulley and loaded with 1-5 kilogramme, a weight sufficient to straighten the wire without occasioning any undue strain. The wire was charged with hydrogen by making it the negative electrode of a small Bunsen's...
Página 353 - Supposing it to rest upon its convex surface, it consists of a lower plate, shaped like a deep saucer or watch-glass; of an upper plate, which is sometimes flat, sometimes more or less watch-glass-shaped; of the oval, thick-walled, flattened corpuscle, which connects the centres of these two plates ; and of an intermediate substance, which is closely connected with the under surface of the upper plate, or more or less fills up the interval between the two plates, and often has a coarsely granular...