20 THE IRRIGATION AGE. 



that the tops are at the heighth of the proposed levee they may be 

 retained as grade stakes as well as line stake for the embankment. 



To find a point in the next contour line below, on which a check 

 levee should be raised so that its embankment will hold back the water 

 to the base of the higher one, begin with the end A at the base of the 

 upper levee and level the triangle in the direction of the proposed 

 levee, measure the distance from the end C to the surface; from this 

 point use the triangle again in the same way and repeat the operation 

 until the sum of all the measurements made from C to the surface is 

 equal to the height of the levee it is intended to construct. Having 

 thus found a starting point for the second contour line proceed to 

 locate this line as before. 



It is obvious that the triangle is most serviceable in determining 

 grades on land which has considerable slope, because more appreciable 

 differences in grade will be noted in each use of its length. The diffi- 

 culty of reaching correct conclusions as to the best position for a ditch 

 or contour check increases as a rule, with the flattening out of the 

 surface. But the use of the triangle is only recommended for small 

 scale work in the absence of more accurate instruments, and under 

 such conditions it is very serviceable. 



To be Continued. 



HAIL FOLLY! 

 On a day I met with Folly, 



Knowing not a flirt was she; 

 She was piquant, she was jolly, 

 And she thrust out melancholy 



With a smile of witchery. 

 1, supine, could not disarm her, 



Though I guessed in some degree 

 There was mischief in my charmer, 



So it came about, you see, 



Folly made a fool of me! 

 Folly tired of her adorer 



When her slave I came to be, 

 Scoffing at the love I bore her, 

 Vexed because I boldly wore her 



Too familiar livery. 

 Petulant, she scourged and left me 



Shorn of all my panoply. 

 So it was when she bereft me 



Of her smile, she set me free 



Folly made a man of me! 

 Frank Roe Batchelder in January 

 Set. 



