( 4T ) 
Time diffoWng the groffer Salts, and fitting them to 
be carried off through the Urinary Paffages. 
^ Theie Waters have been found of excellent Avail 
m many other Illneffes, befides the Scurvy and Evil 
But 1 forbear mentioning any other Cafes, left I 
teefpafs apinft good Manners, by making my firft 
Vifit too long. I am with all due Refpel, ^ 
SIR, 
T 1 M very humble and obedient Servant, 
Holf, Dec. 16. 
John Lewis^ 
m. A further Account of a new Machine, called 
the Marine Surveyor, dejlgned for the Men. 
furatwn of the Way of a Ship at Sea, more cor- 
fte jy tie Log, at prefent in Ufe, or 
any other Method hitherto itiVented for that <Pur- 
' Saumarez, of the 
IJland of Guernfey, <Part of his Maieftys 
antient Dutchy of Normandy. 
H aving given an Account of. my Projeffion 
for afcertaining the Run of a Ship at Sea 
Which has appeared in the Philofophkal franfaBions 
the Royal Socfety,_ Vol. xxxiii, for the Months 
^ovemheT and December 171^ • as alfn in 
thofe for the Months of March ApkfsjJt-, 
and 
• • 
