Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Том 67American Philosophical Society, 1928 |
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Сторінка 235
... orbit around the sun . Out of these two bricks , the proton and the electron , the attempt has been made to explain all the architecture of nature , and all that nature does . What then are the properties of these bricks whereby they ...
... orbit around the sun . Out of these two bricks , the proton and the electron , the attempt has been made to explain all the architecture of nature , and all that nature does . What then are the properties of these bricks whereby they ...
Сторінка 239
... orbits as planets revolve around the sun . Sup- pose we take the lightest atom , the atom of hydrogen . This contains nothing but a single proton with an electron revolving around it . In order to picture to you the relative magnitudes ...
... orbits as planets revolve around the sun . Sup- pose we take the lightest atom , the atom of hydrogen . This contains nothing but a single proton with an electron revolving around it . In order to picture to you the relative magnitudes ...
Сторінка 240
... orbits as many electrons as there are unbalanced protons in the nucleus . Thus , helium , the atom next to hydrogen in weight , has a nucleus containing two unbalanced protons , and two electrons revolving in orbits around them . If ...
... orbits as many electrons as there are unbalanced protons in the nucleus . Thus , helium , the atom next to hydrogen in weight , has a nucleus containing two unbalanced protons , and two electrons revolving in orbits around them . If ...
Сторінка 241
... orbit . Now Bohr's first Now Bohr's first assumption amounts to supposing that the orbits must be such that these areas are integer multiples of the area for the smallest . We can have an orbit which makes this area twice , three times ...
... orbit . Now Bohr's first Now Bohr's first assumption amounts to supposing that the orbits must be such that these areas are integer multiples of the area for the smallest . We can have an orbit which makes this area twice , three times ...
Сторінка 242
... orbits , returns to the orbit from which it was thrown , or to some intermediate orbit , it gives out the whole of its surplus energy in the form of vibrations of definite wave length , determined entirely by the amount of energy which ...
... orbits , returns to the orbit from which it was thrown , or to some intermediate orbit , it gives out the whole of its surplus energy in the form of vibrations of definite wave length , determined entirely by the amount of energy which ...
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adrenals airplane Alaska Amer American amphibian anthropoid atom Bohr brachiating Buriats cell chimpanzee cholesterol climate coast corals cusp cusp formula Diatryma digit distal distance Dryopithecus Dryopithecus pattern electron Eocene evolution fact feet flight forecast frequency gorilla groove system hand hind humerus hydrogen Jefferson papers known layer lecithin Lewis Lewis's lichens limb lipoids lobe-finned fishes LOWER MOLAR PATTERN lower molar teeth mammals McMahon measured meteorological methods motion muscles natural Negroes Notharctus nucleus observations observatories Omorhamphus orbits oscillograph outer parallax pectoral Pedro Dome Philadelphia photographic plants plate present primates primitive problem Professor proper motions Pursh rainfall rigid airships Sajous scientific seeds septa shoulder-girdle species specimen stage stars stellar distances surface temperature tetrapod theory third molar tissue trees Trianaeopiper trochlear process tundra vegetation velocity weather White Spruce winds winter
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Сторінка 102 - Yet I doubt not through the ages one increasing purpose runs, And the thoughts of men are widened with the process of the suns.
Сторінка 339 - Two of far nobler shape, erect and tall, God-like erect, with native honour clad In naked majesty, seemed lords of all, And worthy seemed; for in their looks divine The image of their glorious Maker shone, Truth, wisdom, sanctitude severe and pure Severe, but in true filial freedom...
Сторінка 152 - So, in like manner, we are assured that " the early progenitors of man were, no doubt, once covered with hair, both sexes having beards ; their ears were pointed and capable of movement ; and their bodies were provided with a tail, having the proper muscles.
Сторінка 11 - Lewis on the subject, nor being able to obtain any information when he probably might be expected here; I thought it a folly to keep Pursh longer idle, and recommended him as Gardener to Doctor Hosack of New York, with whom he has since lived. The original specimens are all in my hands, but Mr. Pursh, had taken his drawings and descriptions with him, and will, no doubt, on the delivery of them expect a reasonable compensation for his trouble. As it appears to me probable that you will interest yourself...
Сторінка 11 - ... the hands of any Botanist, either in America or Europe who might rob Mr. Lewis of the right he had to first describe and name his own discoveries in his intended publication, and indeed I had strong reasons to believe this opportunity was coveted by (blank) which made me still more careful of the plants.
Сторінка ix - The officers and council to whom was referred the letter of Doctor Warren, of Boston, inclosing a circular from a meeting of gentlemen at Boston, on the subject of the formation of an American Association for the Promotion of Science, submitted the following resolution, which was adopted by the Society. Resolved, That the American Philosophical Society, having given the most respectful attention to the letters laid before them by Doctor WE Homer, and to the circular letter from the Committee of gentlemen...
Сторінка 9 - I have several sorts growing of the seeds you were pleased to send me, among which are four varieties of Currants, and I am confident that I shall have plants from every kind received.
Сторінка 235 - ... it to the size of a pin's head, that pin's head would, on the same scale of magnification, attain a diameter equal to the diameter of the earth's orbit around the sun.
Сторінка 15 - Thouin merits at our hands. he expresses to me a great desire for the plants of the region beyond the Missisipi. if within the reasonable compass of the mail, it will come safest to me thro' that. if larger, the stage is a good conveyance if a passenger can be found who will take charge of it. such opportunities to Richmond must be almost daily with you, and if addressed to Messr.
Сторінка 16 - ... literally as white as snow, which remain on the bush through the winter, after its leaves have fallen, and make it an object as singular as it is beautiful. We call it the snow-berry bush, no botanical name being yet given to it, but I do not know why we might not call it Chionicoccos, or Kallicoccos. All Lewis's plants are growing in the garden of Mr. McMahon, a gardener of Philadelphia...