PONDS ON THE SUMMITS OF CHALK HILLS. 197 



wonder, therefore, that they contribute much to pools and 

 str6cinis. 



That trees are great promoters of lakes and rivers, appears 

 from a well-known fact in North America , for, since the Too* 

 and forests have been grubbed and cleared, all bodies of water 

 are much diminished : so that some streams, that were very 

 considerable a century ago will not now drive a common 

 mill.* Besides most woodlands, forests, and chases, with us, 

 above h P morasses > no doubt f r the reason given 



h^H^nf'r!^ "'"I' few Pj lenomena are more strange than 

 Hie state of little ponds on the summits of chalk hills, many 



nS Vn ne T VCT d 1 m thC " 10St tr >' !n ' drou ^ hts of Bumme/, 

 on chalk hills I say, because in many rocky and gravelly soils 

 springs usually break out pretty high on the side! SfKteS 



dir c t S " -M T mt T S ; i Ut " PerS n aC 1" aiated -ith chalky 

 districts will allow that they ever saw springs in such a soil 

 but in valleys and bottoms, since the waters "of so pervious a 

 stratum as chalk all he on one dead level, as well-diggers have 

 assured me again and again, f 



n? r ha l' e T ny SUCh little TOund P nds in this di ^rict ; 



id one in particular on our sheep-down, three hundred feet 



above my house , which, though never above three feet deep 



m the middle, and not more than thirty feet in diameter, and 



* Vide Kalm's Travels to North America. 



s P hofe, 1h T wlter i abn t ey f 1 ? ev 1 onshire - Within a mile of the 





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