94 YALE AGRICULTURAL LECTURES. 



will discharge first, and the top one last. The capacity of pipe- 

 tile is in proportion to the squares of their diameter : Thus, if 

 an inch tile will carry one inch of water, a two-inch will carry 

 four inches, a three-inch nine, and so on. Inch tiles, therefore, 

 although perhaps large enough to hold all the water that we 

 would discharge from our fields, are practically not large 

 enough, for they become filled at say half way down the slope, 

 and of course all the ground they pass through after that might 

 as well have no tiles beneath it. A two-inch bore is the 

 smallest Judge French would recommend for general use, and 

 although previously a friend to smaller sizes. I feel convinced 

 of the justness of his arguments, and shall hereafter recommend 

 and use accordingly. Laterals should be jointed into the 

 mains, pointing doion stream^ and enter the mains near the 

 top ; by this plan a good fall and unimpeded discharge are 

 insured. In respect to the minimum of fall consistent with 

 good function of tile drains, the lecturer stated that one inch 

 fall in each rod of length was ample; three inches to the 100 

 feet was a fair proportion, but then the tiles should be larger ; 

 and so on to the end of the calculation. 



Before the morning lecture, a discussion was held at the 

 Temple, as usual, in which any person present was at liberty to 

 participate. 



Mr. QUINCT alluded to the advantages of the soiling system 

 his pet subject in doing away with interior fences on a farm. 

 These, said he, are a great nuisance, besides taking up valuable 

 space; they hinder plowing, raking, tedding, and other opera 

 tions of farming by horse-power. Tedding by horse power is 

 something new in this country, though practised in England 

 extensively. The tedder is a cylinder, revolving on an axle 

 supported by two wheels, like a Delano horse-rake. This 

 cylinder revolves with rapidity, and is furnished with teeth, 

 which pick up the grass and flirt it off in a shower behind the 

 machine. It will do the work of ten or twelve of those Irish 

 gentlemen who pick up and turn over every lick of hay as 



