202 



THE GUIDE TO NATURE. 



FIG. 1. PONDS TWO, THREE AND FOUR. 



wholesale of three dollars and fifty 

 cents to eight dollars and fifty cents 

 per thousand, a satisfactory return for 

 the considerable investment seems as- 

 sured. 



As indicated by the appended field 

 sketch, the ponds are located as favored 

 by the natural contour of the narrow 

 valley. Some are depressions in the 

 soil which required little labor in their 

 construction ; others are partly bor- 

 dered by earth walls, and many are 

 surrounded by earth embankments. 



From the point of intake to outlet 

 there is an even drop or decline down 

 grade to the intersecting roadway, so 

 that the water flow is by gravity the 

 whole length of the series of ponds. 



The approximate area of the ponds is 

 the following : 



Xo. i Pond 85 by 40 feet 



" 2 " 70 " 30 " 



"3 " 7o" 3 o " 



" 4 " 90 feet diameter 



"5 " 35 " 30 feet 



" 6 " /0"40 " 



FIG. 2. UPPER PONDS. NUMBERS SEVEN TO SIXTEEN. 



