Proceedings of the American Academy of Arts and Sciences, Volume 17American Academy of Arts and Sciences., 1882 - Humanities |
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acuminate acute air-dried salt analyses antimony baric base beam belong Benth boiling Boston bracteis bracts bromide Calculated calyx Cambridge carbonate carpels caudal caudal fin chromatophores Coahuila colors corolla crystals curcumin Deflection dibromacrylic acid dorsal and anal dried embryonic ether Fishes flowers foliis formula fruit glabrous grammes Gray Guanajuato Guanajuato Dugès H₂O H₂SO heat Hemsl herbarium Hort hydrobromic acid inches long insects involucre lanceolate leaflets leaves length less lines long Linnĉan lobes molybdic Monclova Monterey nearly Nuevo Leon Nutt oblong obtained obtuse ovate oxide P₂O Parry & Palmer pectorals pedicels peduncles petals plant potassic precipitate pubescent racemes rays Saltillo San Luis Potosi San Miguelito San Miguelito Mountains Schaffner sepals sessile Sierra Madre slender soluble solution south of Saltillo species specimens stage Plate stems substance gave Sutherland Springs temperature Texas thermometer Torr tube ventrals Willd yellow young
Popular passages
Page 413 - Lavergne, undertaken by desire of the Academy of Moral and Political Sciences of the Institute of France...
Page 441 - 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.
Page 461 - I was surprised by finding how large a number of insects were caught by the leaves of the •common sun-dew (Drosera rotundifolia) on a heath in Sussex.
Page 460 - Insects" appeared in 1862, thus forming the second volume of the whole series; 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...
Page 259 - Acad. XVI. 364). Very perfect definition would not be required, since it would affect all the stars equally. To an amateur who would regard the complexity of an instrument as a serious objection to it, a means is now afforded of easily reducing his estimates of magnitude to an absolute system, and thus rendering them of real value.
Page 466 - 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.
Page 30 - 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 twenty-four hours, that the sulphate of potassium may crystallize.
Page 51 - IT and iri denote the heat — measured in dynamical equivalents — absorbed and evolved at the hot and cold junctions respectively in unit time by unit current. Let E be the electromotive force of a battery, maintaining a current / in such a direction as to cause absorption of heat at the hot junction. Then if R be the whole resistance of the circuit, we have by Joule's law and the first law of thermodynamics : — £!+*!— ^!=11!*. (1) Supposing the whole energy of the current wasted in heat....
Page 263 - 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...
Page 187 - ... and comparatively stable characters to the species as we find them in their native haunts. I am not very confident of the success of my prolonged endeavors to put these genera into proper order and to fix the nomenclature of the older species; and in certain groups absolute or practical definition of the species by written characters or descriptions is beyond my powers.