The Physical Basis of SocietyD. Appleton and Company, 1916 - 406 من الصفحات |
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الصفحة 1
... hence these are called Protohydrogen stars . Helium is also present with hints of magnesium and calcium . In the helium - gas stars ( Taurus , Algol ) helium is prominent along with hydrogen , while carbon , oxygen and nitrogen 1.
... hence these are called Protohydrogen stars . Helium is also present with hints of magnesium and calcium . In the helium - gas stars ( Taurus , Algol ) helium is prominent along with hydrogen , while carbon , oxygen and nitrogen 1.
الصفحة 11
... hence a covering of fine particles helps to retain the moisture . For one ton of clover hay some 1560 tons of water are used . Here again the significance of water is indicated . Not merely does it furnish a large part of the substance ...
... hence a covering of fine particles helps to retain the moisture . For one ton of clover hay some 1560 tons of water are used . Here again the significance of water is indicated . Not merely does it furnish a large part of the substance ...
الصفحة 15
... Hence we divide the plants in our gardens into three groups : tender , half - hardy , hardy . The first are peculiarly susceptible to frost ( such as cannas ) ; the second will endure moderate cold and occasionally survive if left in ...
... Hence we divide the plants in our gardens into three groups : tender , half - hardy , hardy . The first are peculiarly susceptible to frost ( such as cannas ) ; the second will endure moderate cold and occasionally survive if left in ...
الصفحة 22
... hence April is colder than November . Snow may blanket the earth and afford pro- tection to seeds , bulbs and roots which would otherwise perish from the cold . This protection is likewise ex- tended to animals , even to man himself ...
... hence April is colder than November . Snow may blanket the earth and afford pro- tection to seeds , bulbs and roots which would otherwise perish from the cold . This protection is likewise ex- tended to animals , even to man himself ...
الصفحة 28
... Hence , every change , as for instance , in the composition of the water of a lake or river will not affect the fauna inhabiting it equally and as a whole , but will act on some individuals ; some will bear the change without being in ...
... Hence , every change , as for instance , in the composition of the water of a lake or river will not affect the fauna inhabiting it equally and as a whole , but will act on some individuals ; some will bear the change without being in ...
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Africa America appeared Australoid average bacteria basis become believe biological birds birth-rate black bass blood body born brain breeding carbon carbon dioxid cause cent century cephalic index changes characters child chromosomes civilization color considered crossing Darwin death death-rate discovered discoveries disease earth eggs environment Europe European evidence evolution exist eyes fact feeble-minded female forms germ cells given groups hair head HEMOPHILIA hence heredity human Huntington's chorea Ibid Inasmuch inches increase individuals inheritance insane insects Kallikak Family known large numbers less living long-headed male man's mated Mendelian ment mental Mongols natural selection nature Negrito Negro normal organisms ovum parents physical plants and animals possible produced race relatively seems skin social society soil species spermatozoon square mile temperature thought tion traits woman women yellow yellow fever
مقاطع مشهورة
الصفحة 155 - Some drill and bore The solid earth, and from the strata there Extract a register, by which we learn, That he who made it, and revealed its date To Moses, was mistaken in its age.
الصفحة 139 - I happened to read for amusement ' Malthus on Population,' and being well prepared to appreciate the struggle for existence which everywhere goes on from long-continued observation of the habits of animals and plants, it at once struck me that under these circumstances favourable variations would tend to be preserved, and unfavourable ones to be destroyed. The result of this would be the formation of new species. Here then I had at last got a theory by which to work...
الصفحة 58 - Near villages and small towns I have found the nests of humble-bees more numerous than elsewhere, which I attribute to the number of cats that destroy the mice.
الصفحة 139 - In October 1838, that is, fifteen months after I had begun my systematic enquiry, I happened to read for amusement Malthus on Population, and being well prepared to appreciate the struggle for existence which everywhere goes on from long-continued observation of the habits of animals and plants, it at once struck me that under these circumstances favourable variations would...
الصفحة 54 - It may be doubted whether there are many other animals which have played so important a part in the history of the world, as have these lowly organized creatures.
الصفحة 186 - The two parents between them contribute on the average onehalf of each inherited faculty, each of them contributing onequarter of it. The four grandparents contribute between them one-quarter, or each of them one-sixteenth ; and so on, the sum of the series i + J + i + TV + , being equal to 1, as it should be.
الصفحة 126 - This fool wishes to reverse the entire science of astronomy; but sacred Scripture tells us that Joshua commanded the sun to stand still, and not the earth.
الصفحة 58 - I am tempted to give one more instance showing how plants and animals, remote in the scale of nature, are bound together by a web of complex relations.
الصفحة 159 - I can conceive in biology would be the discovery of the instability which leads to the continual division of the cell. When I look at a dividing cell I feel as an astronomer might do if he beheld the formation of a double star: that an original act of creation is taking place before me.
الصفحة 58 - I have also found that the visits of bees are necessary for the fertilization of some kinds of clover; for instance, 20 heads of Dutch clover (Trifolium repens) yielded 2,290 seeds, but 20 other heads protected from bees produced not one.