FREE BOOKS

Author's List




PREV.   NEXT  
|<   123   124   125   126   127   128   129   130   131   132   133   134   135   136   137   138   139   140   141   142   143   144   145   146   147  
148   149   150   151   152   153   154   155   156   157   158   159   160   161   162   163   164   165   166   167   168   169   170   171   172   >>   >|  
has "patronized" into notice some caprice of an aspiring engineer, and straight-way the kingdom is convulsed with contests to set up or cast down these idols. By careful observation, it is said, we may find "sermons in stones, and good in everything;" and, standing aloof from all exciting controversies, we may often profit, not only by the science and wisdom of our brethren, but also by their errors and excesses. If, by the help of the successes and failures of our English neighbors, we shall succeed in attaining to their present standard of perfection in agriculture, we shall certainly make great advances upon our present position. As the distances of drains apart, depend manifestly on many circumstances, which may widely vary in the diversity of soil, climate, and cost of labor and materials to be found in the United States, it will be convenient to arrange our remarks on the subject under appropriate heads. DISTANCES DEPEND UPON THE NATURE OF THE SOIL. Water runs readily through sand or gravel. In such soils it easily seeks and finds its level. If it be drawn out at one point, it tends towards that point from all directions. In a free, open sand, you may draw out all the water at one opening, almost as readily as from an open pond. Yet, even such sands may require draining. A body of sandy soil frequently lies not only upon clay, but in a basin; so that, if the sand were removed, a pond would remain. In such a case, a few deep drains, rightly placed, might be sufficient. This, however, is a case not often met with, though open, sandy soil upon clay is a common formation. Then there is the other extreme of compact clay, through which water seems scarcely to percolate at all. Yet it has water in it, that may probably soak out by the same process by which it soaked in. Very few soils, of even such as are called clay, are impervious to water, especially in the condition in which they are found in nature. To render them impervious, it is necessary to wet and stir them up, or, as it is termed, _puddle_ them. Any soil, so far as it has been weathered--that is, exposed to air, water and frost--is permeable to water to a greater or less degree; so that we may feel confident that the upper stratum of any soil, not constantly under water, will readily allow the water to pass through. And in considering the "Drainage of Stiff Clays," we shall see that the most obstinate clays are usually so affected by the operati
PREV.   NEXT  
|<   123   124   125   126   127   128   129   130   131   132   133   134   135   136   137   138   139   140   141   142   143   144   145   146   147  
148   149   150   151   152   153   154   155   156   157   158   159   160   161   162   163   164   165   166   167   168   169   170   171   172   >>   >|  



Top keywords:
readily
 

present

 

drains

 
impervious
 
common
 
require
 

formation

 

draining

 

extreme

 

scarcely


percolate
 
compact
 

removed

 

remain

 

frequently

 

notice

 

sufficient

 

rightly

 

stratum

 

constantly


confident
 

greater

 

degree

 
affected
 

operati

 
obstinate
 
Drainage
 

permeable

 

condition

 

nature


called

 

patronized

 
process
 
soaked
 

render

 
weathered
 

exposed

 

termed

 

puddle

 

engineer


perfection

 

agriculture

 
standard
 

attaining

 
English
 
neighbors
 

succeed

 

advances

 
manifestly
 

circumstances