Popular Science Monthly, Volumen73McClure, Phillips and Company, 1908 |
Dentro del libro
Resultados 1-5 de 94
Página 6
... produced ; and desert conditions have also intervened locally ; but these diastrophic effects are perhaps rather rejuvenations necessary to the preservation of the continents than destructive episodes . Whenever such heights and slopes ...
... produced ; and desert conditions have also intervened locally ; but these diastrophic effects are perhaps rather rejuvenations necessary to the preservation of the continents than destructive episodes . Whenever such heights and slopes ...
Página 8
... producing soil from such rock is partly chemical and partly physical . Certain rock substances are made soluble and become plant food or plant poisons , while others remain relatively insoluble , but are reduced to a finely divided ...
... producing soil from such rock is partly chemical and partly physical . Certain rock substances are made soluble and become plant food or plant poisons , while others remain relatively insoluble , but are reduced to a finely divided ...
Página 14
... produce of the region . " Shortage of cars " has become a familiar complaint in the wheat fields of the northwest ... produced little or nothing , while crop improvement and intelligent soil management are adding millions of bushels ...
... produce of the region . " Shortage of cars " has become a familiar complaint in the wheat fields of the northwest ... produced little or nothing , while crop improvement and intelligent soil management are adding millions of bushels ...
Página 20
... produced the steepest and most rugged parts of the whole Appalachian region . Here the heaviest rainfall comes in January , February and March . Add to these factors the frequent complications of melting snow and frozen ground , which ...
... produced the steepest and most rugged parts of the whole Appalachian region . Here the heaviest rainfall comes in January , February and March . Add to these factors the frequent complications of melting snow and frozen ground , which ...
Página 24
... produce floods has been suggested many times , and it seems likely that if constructed in sufficient numbers they ... produces flood stages could be impounded and held up with these important results : excessive and destructive high ...
... produce floods has been suggested many times , and it seems likely that if constructed in sufficient numbers they ... produces flood stages could be impounded and held up with these important results : excessive and destructive high ...
Contenido
297 | |
298 | |
312 | |
313 | |
314 | |
383 | |
393 | |
395 | |
183 | |
184 | |
194 | |
198 | |
200 | |
202 | |
203 | |
204 | |
278 | |
279 | |
397 | |
398 | |
400 | |
471 | |
482 | |
492 | |
496 | |
558 | |
569 | |
Otras ediciones - Ver todas
Términos y frases comunes
Algonquian American animals appears Aryan average bacteria become body cent character cities course crops Darwin Dimetrodon disease engine Eningen enzyme evolution excretions experience fact Falls feet Fife fish fishery fossil groups growth heat human humor important increase institutions interest Iroquois J. J. Thomson Joule known Lake land language Lenape less living Lord Kelvin mathematics matter means ment mental method milk mind Mississippi nature nearly Niagara Niagara Falls Niagara River ONTARIO POWER organic philosophy physical physiological physiological psychology plants pounds practical pragmatism present problem produced Professor Prussia psychology question race radium Red Fife region relation river Rumford scholarship scientific side Siouan social society soil species sturgeon surface teachers theory things tion to-day trees wheat York zoology
Pasajes populares
Página 442 - It is better to be a human being dissatisfied than a pig satisfied; better to be Socrates dissatisfied than a fool satisfied.
Página 442 - Few human creatures would consent to be changed into any of the lower animals for a promise of the fullest allowance of a beast's pleasures; no intelligent human being would consent to be a fool, no instructed person would be an ignoramus, no person of feeling and conscience would be selfish and base, even though they should be persuaded that the fool, the dunce, or the rascal is better satisfied with his lot than they are with theirs.
Página 145 - And everybody praised the Duke Who this great fight did win.' 'But what good came of it at last?' Quoth little Peterkin: — 'Why, that I cannot tell,' said he, 'But 'twas a famous victory.
Página 150 - After the scole of Stratford atte Bowe, For Frensh of Paris was to hir unknowe. At mete wel y-taught was she with-alle; She leet no morsel from hir lippes falle, Ne wette hir fingres in hir sauce depe.
Página 145 - Those who desire this dreadful literature can find it ; it has a ' disciplinary value ;' but I will not even enumerate it in a footnote. The only amusing part of it is that Fechner's critics should always feel bound, after smiting his theories hip and thigh and leaving not a stick of them standing, to wind up by saying that nevertheless to him belongs the imperishable glory of first formulating them and thereby turning psychology into an exact science (!). " ' And everybody praised the duke Who this...
Página 10 - Historical evidence enforces this danger. In the Orient there are large tracts almost absolutely bare of soil, on which stand ruins implying former flourishing populations. Other longtilled lands bear similar testimony. It must be noted that more than loss of fertility is here menaced. It is the loss of the soil-body itself, a loss almost beyond repair. When our soils are gone, we too must go, unless we shall find some way to feed on raw rock or its equivalent.
Página 104 - ... experiments having reference to the same subject. We often find, in the case of questions to the solution of which the development of science points, that several heads, quite independent of each other, generate exactly the same series of reflections. I myself, without being acquainted with either Mayer or Colding, and having first made the acquaintance of Joule's experiments at the end of my. investigation, followed the same path. I...
Página 220 - When the Lenape arrived on the banks of the Mississippi they sent a message to the Alligewi to request permission to settle themselves in their neighborhood. This was refused them, but they obtained leave to pass through the country and seek a settlement farther to the eastward.
Página 10 - ... years. Under such an estimate, to preserve a good working depth, surface wastage should not exceed some such rate as one inch in a thousand years. If one chooses to indulge in a more liberal estimate of the soil-forming rate, it will still appear, under any intelligent estimate, that surface wastage is a serious menace to the retention of our soils under present modes of management.
Página 219 - The Lenni Lenape (according to the tradition handed down to them by their ancestors) resided many hundred years ago in a very distant country in the western part of the American continent. For some reason which I do not find accounted for, they determined on migrating to the eastward, and accordingly set out together in a body. After a very long journey and many nights...