The American Journal of ScienceJ.D. & E.S. Dana, 1891 |
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amount angle antimony appears asphalt beds carbonate Carboniferous cent character chemical chloride chlorite clays color comet containing Creek crystalline crystals deposits described determined dike direction East Rock eastern evidence examination experiments fact feet ferrous fissures formation fossil garden Geological Survey glacial gneiss granite gravels hydriodic acid hydrochloric acid hydrogen iodine iron Lake layers lignite limestone liquid mass material method miles Mill Rock mineral mountains nearly observed obtained occur orbit origin oxide Pit River plane plants plates portion potassium present pressure probably produced Prof prominence quartz realgar region rhyolite ridge River rubber salt sand sandstone schists seen shales siderite siliceous silicified wood Silurian silver slope sodium solution species specimens Steep Rock series Stegosaurus strata substance sulphuric acid surface temperature Tertiary thickness tion trap tube uraninite valley volume West Rock
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Сторінка 552 - Thousand double-column octavo pages of reading-matter yearly. It presents in an inexpensive form, considering its great amount of matter, with freshness, owing to its weekly issue, and with a...
Сторінка 224 - ... employed by him, have very little influence on the result. The rate of propagation of an electrical disturbance along a conductor depends mainly on its capacity and coefficient of self-induction, and only to a small extent on its resistance. Hertz concludes that, owing to the great rapidity of the alternations, the magnetism of the iron is unable to follow them, and therefore has no effect on the selfinduction. When a portion of the micrometer circuit...
Сторінка 302 - This last shrub (shepperdia), which may be said to be the most beautiful ornament that decks out the wild prairies, forms a striking contrast to the rest of the foliage, from the blue appearance of its leaves, by which it can be distinguished for miles in distance. The fruit which it produces in such incredible profusion, hanging in clusters to every limb and to every twig, is about the size of ordinary currants, and not unlike them in...
Сторінка 297 - Anacharis find in the waters of England and the continent that it did not have at home, and why should its energy begin to wane now ? In Australasia one of the most striking of these intruders is Sweet-briar. Introduced as a hedge plant it has run over certain lands like a weed, and disputes every acre of some arable plats. From the facility with which it is propagated, it is almost ineradicable.
Сторінка 293 - I mention this not as an isolated example of what is being accomplished in commercial botany, but as a fair illustration, of the thoroughness with which the problems are being attacked. It should be further stated that at the garden in question assiduous students of the subject are eagerly welcomed and are provided with all needed appliances for carrying on technical, chemical, and pharmaceutical investigations. Therefore I am justified in saying that there is every reason for believing that in the...
Сторінка 281 - All the cultivated varieties present the same peculiarities in their inflorescence, but up -to the time of flowering they exhibit most marked differences from each other and from the original wild plant. In most of the Cabbages, it is chiefly the leaves that are developed by cultivation ; these for the most part become imbricated or overlap one another closely, so as to form a more or less compact head, the heart or interior of which is composed of the central undeveloped shoot and the younger leaves...
Сторінка 288 - Now it seems highly probable that either by hybridizing directed to this special end, or by careful selection of forms indicating this tendency to the correlated changes, we may succeed in obtaining important additions to our seedless or nearly seedless plants. Whether the ultimate profit would be large enough to pay for the time and labor involved is a question which we need not enter into ; there appears to me no reasonable doubt that such efforts would be successful. There is no reason in the...
Сторінка 282 - Bailey has called attention in the case of the tomato. Suppose we are strolling along the beach at some of the seaside resorts of France, and should fall in with this coarse cruciferous plant, with its sprawling leaves and strong odor. Would there be anything in its appearance to lead us to search for its hidden merit as a food plant? What could we see in it which would give it a preference over a score of other plants at our feet? Again, suppose we are journeying in the...
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