[ «J5 ] 
XXiL An Account of a new Purging Spring 
dtfcovend at Dulwich in Surrey, by Mr* 
John Martyr^ F. R.S. Prof. Botan. Cantab. 
T\Ulwich is a Village lying about Six Miles South 
of London , at the Poor of that Ridge of Hills 
which divides the Counties of Kent and Surrey . The 
Purging Springs, which have been efkemcd for about 
a hundred Years, and are commonly known by the 
Name of *2 Dulwich Witters, have been improperly fo 
called i thofe Springs arifing in a Valley on the South 
Side of thofe Hills, in the Middle of a large Common 
belonging to the Parifh of Lewifham in Kent ; 
whereas Dulwich is on the North Side of the Hills, 
in the Parifh of Camberwell in Surrey. 
There has not been any medicinal Spring obferved 
in Dulwich , before that which is the Occafion of this 
Difcourfe. 
In the Autumn of 1739, Mr. Cox, the Matter of a 
well-known Houfe of good Entertainment, called the 
Green Man at Dulwich , lying about a Mile beyond 
the Village, was defirous to dig a Well for the Ser- 
vice of his Houfe, there being no Spring of good 
Water near it. And as it was probable, that he would 
be obliged to dig pretty deep, I was willing to obferve 
what Strata of Earth he dug through. The firft 20 
Feet in Depth feemed to be only the Clay, which, in 
a long Trad of Time, had been walked off from 
the deep Hill, at the Foot of which his Houfe is fitu- 
ated. It was intermixed with Pieces of Roots and 
Leaves, and with other Fragments of vegetable Sub- 
5 Ct ftances. 
