Proceedings of the American Academy of Arts and Sciences, المجلد 91882 |
طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
acid acuminate acute acutish antimony atoms base beam Benth Boston bracts branched bromide calyx capsule Caracol Mountains carbonic carpels caudal chloride chromatophores Coahuila colors corolla crystals curcumin Deflection dibromacrylic dorsal and anal elongated embryonic fin Fishes flowers foliis fruit gave glabrous Gray Guanajuato Guanajuato Dugès H₂O heat Hemsl herbarium inches long insects involucre lanceolate leaflets leaves length Lerios less linear lines broad lines long Linn lobes Lophius Lorenzo de Laguna Monclova Monterey narrow narrowly nearly Nuevo Leon Nutt oblong obtuse ovate oxide P₂O Parras Parry & Palmer pectorals pedicels peduncles petals petioles pigment cells pigment spots precipitate pubescent racemes salt Saltillo San Luis Potosi San Miguelito San Miguelito Mountains San Rafael Mountains Schaffner sepals sessile short Sierra Madre silver slender soluble solution south of Saltillo species specimens stage Plate stems Sutherland Springs temperature Texas Torr ventrals Willd yellow young
مقاطع مشهورة
الصفحة 433 - It can now be asserted upon convincing evidence that savagery preceded barbarism in all the tribes of mankind, as barbarism is known to have preceded civilization.
الصفحة 452 - Insects" appeared in 1862, thus forming the second volume of the whole scries; and the two volumes " On the Effects of Cross- and Self-Fertilization in the Vegetable Kingdom," and " The Different Forms of Flowers on Plants of the same Species...
الصفحة 458 - The proof of this great generalization, like that of all other generalizations, lies mainly in the fact that the evidence in its favor is continually augmenting, while that against it is continually diminishing, as the progress of science reveals to us more and more of the workings of the universe.
الصفحة 426 - Thus if we are ever able to acquire certain knowledge respecting the physical state of the sun and other stars, it will be by an examination of the light they emit.
الصفحة 418 - The point of departure was a new theory of value, which he defined as the measure of the resistance to be overcome in obtaining things required for use, or the measure of the power of nature over man. In simpler terms, value is measured by the cost of reproduction. The value of every article thus declines as the arts advance, while the general command of commodities constantly increases. This causes a constant fall in the value of accumulated capital as compared with the results of present labor,...
الصفحة 28 - Add to the sulphuric acid one part of the water and cool the mixture. Then dissolve the potassium bromide in six parts of the water by means of heat, supplying the loss of water by evaporation during the heating. Pour the diluted sulphuric acid slowly into the hot solution with constant stirring, and set the mixture aside for 24 hours that the sulphate of potassium may crystallize.
الصفحة 197 - Arizonicse, etc.; Characters of the New Plants of certain Recent Collections, mainly in Arizona and adjacent Districts, etc.
الصفحة 452 - Sex," — which extended the hypothesis to its logical limits, — and that "On the Expression of the Emotions in Man and the Lower Animals," published in 1872, which may be regarded as the last of this series. Since then Mr. Darwin appears to have turned from the highest to the lower forms of life, and to have entered upon the laborious cultivation of new and special fields of investigation, which, although prosecuted on the lines of his doctrine and vivified by its ideas, might seem to be only...
الصفحة 233 - There cannot be more than four layers in the wings and scales, which show principally such colors in insects, two external ones belonging to the cuticula, and two internal ones belonging to the hypodermis. The naked wings of Diptera and Neuroptera often show beautiful interference colors. The scales of Entimus and other Curculionidae are well known for their brilliancy, and it is interesting to remark that when dry scales are examined with the microscope, many are found partly injured, which give...
الصفحة 17 - T J 5 of this difference with certainty. We therefore prepared with great care a button of pure * metallic silver, which we annealed, and rolled out to a thin ribbon. We then weighed out from two to four grammes of bromide of antimony, prepared by sublimation as described above, and dissolved this salt in an aqueous solution of tartaric acid, which we then transferred to a litre flask, and diluted to about 500 cubic centimetres. We next very accurately weighed out a quantity of silver slightly less...