[ 92 ] 
Received December n, 1766. 
XI. Experiments on Rathbone-Place TV ater : 
By the Hon. Henry Cavendifh, F. R. S. 
Read Feb. Lucas has given a fhort exami- 
l;6? ’ 1 3 nation of this water in the firft part 
of his treatife of waters. It is the produce of a large 
fpring at the end of Rathbone-place, and ufed a few 
years ago to be railed by an engine for fupplying part 
of the town. The engine is now deftroyed ; but 
there is a pump, nearly in the fame fltuation, which 
yields the fame kind of water. It is the water of this 
pump, which was ufed in thefe experiments. 
Moll: waters, though ever fo tranfparent, contain 
fome calcareous earth, which is feparated from them 
by boiling, and which feems to be dilfolved in them 
without being neutralized by any acid, and may 
therefore not improperly be called their unneutralized 
earth. The following experiments were made chiefly 
with a view of enquiring into thecaufe of thefufpenfion 
of this earth, for which purpofe this water leemed 
well adapted ; as it contains more unneutralized earth 
than molt others. 
Thefe experiments were made towards the latter 
end of September 1765, after a very dry fummer ; 
whereby the water was moft likely more impreg- 
nated with faline and other matters than it ul'ually 
is. 
The 
