The American Naturalist, Volume 5Essex Institute, 1871 - Biology |
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Common terms and phrases
abundant Academy Amer American animals appear beds bees birds body bones Brachiopods Carboniferous cave cells character cilia coal coast Coleoptera collection color common containing Cretaceous Crustacea crystals deposits developed distinct division eggs examined F. W. PUTNAM fact fauna feet figures fins fishes flowers formation fossil genera genus geodes geological Gill gneiss Granada hundred inch long insects known larva larvæ leaves length Lepidoptera less limestone mass microscope Mountains Museum Natural History NATURALIST nearly nest Neuroptera North object observed organs origin paper peculiar perithecia plants pollen portion prairies present probably Prof Professor Quito regard region remarkable Report resemblance river rocks Rotifer S. I. Smith sandstone schists Schw seen shells side silicates Silurian similar species specimens spores strata structure surface Tertiary thick tion trees UNIV upper valley vegetable vertebrates
Popular passages
Page 455 - Hudson, the Green Mountains of Vermont, and the White Mountains of New Hampshire.
Page 332 - Sweet are the uses of adversity, Which, like a toad, ugly and venomous, Wears yet a precious jewel in his head...
Page 706 - ... with a race whose social and religious conditions are among the most degraded exhibited by the human race. All this goes to show and cannot be too much insisted upon, that the relative capacity of the skull is to be considered merely as an anatomical and not as a physiological characteristic, and unless the quality of the brain can be represented at the same time as the quantity, brain measurement cannot be assumed as an indication of the intellectual position of races any more than of individuals.
Page 458 - ... are sometimes coarsegrained and porphyritic. They are less strong and coherent than the gneisses of the Laurentian, and pass, through the predominance of mica, into mica-schists, which are themselves more or less tender and friable, and present every variety, from a coarse gneiss-like aggregate down to a fine-grained schist, which passes into argillite.
Page 772 - ... ready for any sort of adventure that promises sport or spoil, even if spiced with danger. Sometimes he prowls about alone, but oftener has a band of choice spirits with him, who keep each other in countenance (for our jay is a coward at heart, like other bullies), and share the plunder on the usual terms in such cases, of each one taking all he can get. Once I had a chance of seeing a band of these guerillas on a raid; they went at it in good style, but came off very badly, indeed.
Page 489 - Rose, Haidinger, Blum, Volger, Rammelsberg, Dana, Bischof, and many others, leads them, however, to admit still greater and more remarkable changes than these, and to maintain the possibility of converting almost any silicate into any other.
Page 489 - ... of organic remains, where carbonate of lime or silica, for example, fills the pores of wood. When subsequent decay removes the woody tissue, the vacant spaces may, in their turn, be filled by the same or another species.* In the second place, we may consider pseudomorphs from alteration, which are the result of a gradual change in the composition of a mineral species. This process is exemplified in the conversion of feldspar into kaolin by the loss of its alkali and a portion of silica, and the...
Page 387 - The objects of the Association are, by periodical and migratory meetings, to promote intercourse between those who are cultivating science in different parts of...
Page 605 - ... the influence of various kinds of compulsion in the lower, and intelligent option among higher animals. Thus, intelligent choice, taking advantage of the successive evolution of physical conditions, may be regarded as the originator of the fittest, while natural selection is the tribunal to which all the results of accelerated growth are submitted. This preserves or destroys them, and determines the new points of departure on which accelerated growth shall build.
Page 457 - ... so characteristic of the White Mountain series, are wanting among the Laurentian rocks. They are also destitute of argillites, which are found in the other two series. The quartzites, and the pyroxenic and hornblendic rocks, associated with great formations of crystalline limestone, with graphite, and immense beds of magnetic iron ore, give a peculiar character to portions of the Laurentian system.