i6a GEOLOGICAL SURVEY OF NEW JERSEY. 



boy.' That was the uniform answer I got from every mill- 

 owner I approached." This seems to indicate that on the level, 

 sandy, or loamy lands of Southern New Jersey cultivation may 

 increase the flow of the springs. 



We believe that the usual difference between forested and 

 cultivated water-sheds is very well illustrated by the Passaic 

 and Raritan respectively, while some of our small red sandstone 

 water-sheds are good types of barren country. In the following 

 table we have contrasted these three types, the data being taken 

 from the Report on Water-Supply of 1894. This table shows 

 in inches of rain-fall the amount of water which would drain 

 out of the ground to the several streams, from their water-sheds, 

 each month during a drought of such a character that the rain- 

 fall is just equal to the evaporation, so that the effect of both 

 rain-fall and evaporation upon the streams is for the time sus- 

 pended. 



These figures are the result of a computation based upon 

 actual gaugings. The gangings themselves show a similar 

 result, but cannot be so accurately compared owing to variations 

 in the rain-fall on the different water-sheds. 



Yield of Springs on Various Types of IVater-Sheds During 



Drought. 



IN INCHES OF RAIN-FAX,!,. 



Total, 3 93 4 14 2.29 



It will be observed that while the Raritan and the Passaic 

 show nearly the same total amount of drainage, the Raritan 

 gives up this water faster in the early months, and, therefore, its 



