Discourses Biological and GeologicalD. Appleton, 1897 - 388 من الصفحات |
طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
Abiogenesis accumulation Anchitherium ancient animals appear Arctogæal Atlantic become body bottom calcareous carbonic acid Carboniferous Carnivora cause Cetacea chalk character cilia cilium coal contains cretaceous deep sea deposit depths Devonian Diatoms distribution doctrine doubt dredge dry land earth Eocene evidence existence fact fathoms fauna favour fermentation fish fluid Foraminifera formation forms fossil genera geological speculation geologists germs give rise globe Globigerina ooze gradually Heteromita Hipparion hypothesis knowledge known less living lobster Mammalia mammals matter Mediterranean Mesozoic microscope Miocene Miocene epoch modern modification monad naturalist nature observed ocean organisms oxygen paleontology particles Pébrine peculiar period Peronospora physical plants protoplasm Radiolaria red clay regions remains remarkable result rocks scientific sea-bottom shells silicious similar species sporangia spores structure substance sugar suppose surface tertiary things tion Torula trawl Triassic types Ungulata Uniformitarianism vegetable whole Wyville Thomson Xenogenesis yeast zoospores
مقاطع مشهورة
الصفحة 112 - At the present day, however, we even more commonly use another name for this peculiar liquid — namely, " alcohol," and its origin is not less singular. The Dutch physician, Van Helmont, lived in the latter part of the sixteenth and the beginning of the seventeenth century — in the transition period between alchemy and chemistry — and was rather more alchemist than chemist. Appended to his " Opera Omnia," published in 1707, there is a very needful " Clavis ad obscuriorum sensum referendum,"...
الصفحة 109 - The result, therefore, of this physical inquiry is, that we find no vestige of a beginning, — no prospect of an end.
الصفحة 22 - The upper valve is almost invariably wanting, though occasionally found in a perfect state of preservation in the white chalk at some distance. In this case, we see clearly that the sea-urchin first lived from youth to age, then died and lost its spines, which were carried away. Then the young Crania adhered to the bared shell, grew and perished in its turn; after which, the upper valve was separated from the lower, before the Echinus became enveloped in chalky mud.
الصفحة 27 - How long it remained in that condition cannot be said; but "the whirligig of time brought its revenges" in those days as in these. That dry land, with the bones and teeth of generations of longlived elephants, hidden away among the gnarled roots and dry leaves of its ancient trees, sank gradually to the bottom of the icy sea, which covered it with huge masses of drift and boulder clay. Sea-beasts, such as the walrus, now restricted to the extreme north, paddled about where birds had twittered among...
الصفحة 321 - Mathematics may be compared to a mill of exquisite workmanship, which grinds you stuff of any degree of fineness; but, nevertheless, what you get out depends upon what you put in; and as the grandest mill in the world will not extract wheat-flour from peascods, so pages of formulae will not get a definite result out of loose data.
الصفحة 252 - It has been ascertained that when one of the spores falls upon the body of a fly, it begins to germinate and sends out a process which bores its way through the fly's skin ; this having reached the interior cavities of its body, gives off the minute floating corpuscles which are the earliest stage of the Empusa. The disease is
الصفحة 5 - ... strong vinegar, there would be a great bubbling and fizzing, and, finally, a clear liquid, in which no sign of chalk would appear. Here you see the carbonic acid in the bubbles ; the lime, dissolved in the vinegar, vanishes from sight. There are a great many other ways of showing that chalk is essentially nothing but carbonic acid and quicklime. Chemists enunciate the result of all the experiments which prove this, by stating that chalk is almost wholly composed of "carbonate of lime.
الصفحة 254 - ... and for attendance, the cultivator has constantly seen his silkworms perish and himself plunged in ruin ; but it means that the looms of Lyons have lacked employment, and that for years enforced idleness and misery have been the portion of a vast population which, in former days, was industrious and well to do.
الصفحة 196 - In other words, every animal is organised upon one or other of the five, or more, plans, the existence of which renders our classification possible. And so definitely and precisely marked is the structure of each animal, that, in the present state of our knowledge, there is not the least evidence to prove that a form, in the slightest degree transitional between any of the two groups Vertebrata, Annulosa, Mollusca, and Caelenterata, either exists, or has existed, during that period of the earth's...
الصفحة 18 - The evidence furnished by the hewing, facing, and superposition of the stones of the Pyramids, that these structures were built by men, has no greater weight than the evidence that the chalk was built by Globigerince ; and the belief that those ancient pyramidbuilders were terrestrial and air-breathing creatures like ourselves, is it not better based than the conviction that the chalk-makers lived in the sea?