ii6 



Journal of Agriculture. 



[8 Feb., 1908. 



long the 660 tubes will serve 40 acres. After the tubes have been placed 

 the ditch bank is built over them; this bank must be well puddled and 

 rammed. The tubes are closed by putting a lath or shingle in front of 

 them, and if they leak by putting a shovelful of earth in front of that. 



Furrows run down the slopes from the tubes. The practice of irrigators 

 varies much with respect to the depth and distance apart of these furrows. 

 In furrows 2 feet apart they may be merely marks not over 3 inches deep 

 and 4 to 6 inches wide. Fig. 10 shows one form of marker which can 

 be weighted to make it sink into the ground to the desired depth; Fig. 11 

 shows another form of marker and Fig. 12 still another. 



Fig. II. Furrower. 



The chief drawback to this method is the cost of making the tubes 

 and placing them in the ditch bank. A simpler method is to put large 

 wooden tubes into the sides of the head ditch from 30 to. 70 feet apart. 

 These empty into a small parallel channel which opens into the field 



