280 



BOAKD OF AGRICULTURE. [Pub. Doc. 





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Here are suggestions for the form of a highway through 

 flat, arable plains and pastures, or clay meadows. This 

 road, too, requires no repairs but fine broken stone, as may 

 be needed to replace the loss to the surface by friction, wind 

 and water. In preparing concave road-beds, the best wheel 

 scrapers may be of the greatest use in skilled hands. 











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Too few people reflect that, if a road is not made a little 

 too high, it will be too low when it is used awhile. A very 

 durable road must be shod for wear, something like a double- 

 soled shoe. Earthen roads rapidly wash and blow away, 

 and even the best new stone work will settle some. M'Adam's 

 " roof" roads and " floors " will be water-tight, because the 

 broken stone is so close as to shed its own superfluous silt, 



