defcribesmot) Watet oat of the Sea , from under the Salt" 
four or five fathoms deep, as fvveet as any Fountain-water. And 
fincekis argued by fome , that fuch Sweet- Water proceeds from 
certain Sweet Water-Springs , that were formerly on the Conti- 
nent, at fome.diftance from the Sea, and came afterwards to be 
covered by the Seas it m ay be prefumed , that in other places we 
may find the like. Befides, we know not , but that there may be 
in many parts, Eiuptioos of large Springs at the Bottom of the 
“Sea, that were never taken in by any of its encroachments. 
The fe Experiments are to be repeated every New Voyage , the mul- 
titude and frequency of them being neceff ary for fin ding out and con ~ 
firming the truth of them which as it will conduce exceedingly to the 
Enlargement of Natural Know ledge, foit may in time produce New and 
more accurate Sea-Maps and Cards , than hitherto have been pub- 
Ujht - 5 and great helps and advantages to Navigation : efpecially thofe 
of the Variation, and Dipping of the Needle the Depth and Salt- 
nefs of the Water $ the Nature of the Ground at the Bottom of the 
Stas and indeed almof every one of the reft ; there being a Defign to 
confider all, and to draw out of them fuch Rules and Dir e ft ions , as may 
bring no lefs Honour, than Benefit to the Englifh Nation, 
The Infirumenrs , defcribed and reprefented in thefe Papers , may be had 
from Mr. Richard Short grave , Operator to the R. Society, to be found at 
Grejham Co l ledge ; who alfo will be ready, if there be occafion , to give more 
particular Directions fortheufe of the fame. 
A DVE RT IS E M EN T. 
I T is defired by Ghri flop her Merret M. D. to inform the Pub - 
lick y that within the f 'face of four Monet hs , he fhall re-pub- 
Itjh his PinaxRernm Natural'ium Britannicarum , with many Ad- 
ditions, and in his propofed New Method s and that he wholly difc laims 
the Second Edit ion of that Book , as being printed and published with- 
out his knowledge. 
IrTtheT^rt? r , 
Printed by T. N. for fohn Marty n at the Bell, a little without 
Temple-Bar , and fames Alleftry in Duck-Lane 7 Printers 
t© the Royal Society , 
