acfcnbes not) Watet o%t of the Sea , from unaetfi^'Salc-Water^ 
four or five fathoms deep , as fweet as any Fountain-water. And 
^fince'tis argued by fome, that fuch Sweet- Water proceeds from 
certain Sweet Water-^Springs , that were formerly oh the Conti- 
nent , at fom.ediftance from the Sea , and came afterwards to be 
covered by the Sea 5 it may be prefumed , that in other placeis we 
may find the like, BefideSj we know not , but that there may be 
in many parts ^ Eruptions of large Springs at the Bottom of th^i 
rSea, that were never taken ia by any of its encroachments. 
Thefe Experiments are to be repeated every New Foyage y the muU 
titudeand frequency of them being necejfary for finding out and con- 
firming the truth of them which as it will conduce exceedingly to the 
Enlargement of Natural Knowledge jfo it may in time produce Nm and 
more accurate S^^'Maips and Czuds^ than hitherto have been pub- 
hjhti, andgreat helps and advantages to Navigation : efpeciatiy thofe 
of theYmmon^ andDl^^mg of ^^^Needle^ Depth WSalt- 
nefs of the Water-, the Nature of theCxomd at the Bottom df the 
Sea and indeed almofl every one of the refi-^ there being d Befign to 
consider all, and to draw out of them fuch Rules and Diyei^ionSyOsmdy 
bring no lefs Honour^ than Benefit to the Englifli Nation. 
The Indriiments , dcfcribed and reprefented in thcfe Papers , may be had 
trom Mr. Richard Shortgrave^ Operator CO the i?. to be found at 
Grejham CoUedge ; who alfo will be ready, if there beoccafion ^ tagive more 
particular Dire(aions for the Life of thefame. / 
ADVERtlSEMENT. 
IT is de fired bj Chriftopher Merret M. D. to inform the Pub- 
lick y that within the fpdce of four Mdneths , he fhall re-pub- 
Itfl) his Pinax Rernm NaturaKum Britannicarum , wHh many Ad- 
ditions^ and in his propofed New Method 5 an A that he wholly difclains 
the Second Edition of that Book^ as beingprinted andpubli^edw th- 
out his knowledge. 
In the S AVOY , 
Printed by T. N. for ^ohn Marty n at the Bell, a little withoiat 
T cmpU'Bar , and ^ames Alleflry in Duck- Lane ^ Priflters 
iQ the Royal Society ^1667. 
