^$fWdters\ An In(lrument to examine the gredtefl Depths of 'the 
Seds% Another^to try for frefh waters in the bottoms of Jvms Sea^-^ 
Pendulum- watches to afcertain Longitudes, But I mu^ refer /.^ 
a greater ftore of fich ufeful Inventions commemorated hj M Sprat 
' 4n his Hiftery of the R . Society. 
Neither had 1 here mention dthele:}hut togive this Advert if ement-^ 
Thdt fometimes one of th fe Inurnment s maj efen a fair Portal for 
more Fo limes of the mo [I oh lining Fhilofofhj, than can be ahjolvd 
ty many hands in [ome /fges. It will not he meer Preface, 1;^^ cloflj 
dgrejahle to the Intention of thefe T raffs ^ if I here inf mceone far^ 
ticular-, which may f of 'hi'] feemto fomeof the Imvefi valtu^ and ye$ 
may chance to frove of greater impertance-y than at frfl we are apt t& 
imagine. I will name good Scales both of the niceji kinds ^ and feme 
of a (ironger frame, Nm this I wouldreprefent^ ^Tis certain^ foms 
Bodies do increafe their weight in a (lror)g Fire: See the Experiment 
inthe faidHifi. of the R. Society, p.22 8. And Honorable Boyle 
hath proved^ That even Solid and Coldeft Bodies have their A t^ 
mofphcres 5 Some their Eledricity 5 and feme their Magnetifmesi 
And ^tis palp able i that [ome draw more Aliment^ either from the 
Marth^or fromfukerraneom Liqt^ors^or Spirits ■> or from the Nutrh 
tiotu parts of the Air^ or ether Influences , whish defcend through the 
Airy than they expend in their Atmofpheres i Andfefhafs nwre Ai 
certain State times ^ till thty have acquired their due Incrementi 
This being obfervdy it ferns eafie to devife^ How to examine by 
Scales^ GiaffeSj^/^i fuch fight furniture^ whence Vegetables ^ many 
iinds of Stones y Metals^ ^nd other Minerals, have more or lc[s of 
their Increment^ and whence they obtain the flronger Fermentation^ 
which conferves them^ or promotes their p erf e 51 ion in their kind-' 
whether Glaf, or what other Materials ^do obfiruB or retard the refori 
of any or all of thefe Spirits ^ Heats ^ or Influences t Whether Ever^ 
greens, the mofl fragrant or ftrong-fentingy hot or cold Plants, dr^w 
mere of their fubfance from the free Air 5 and which draw more 
from the fubterraneal fupplyes^ And fo we maf examine Ear ths 
and Minerals, We fee many t racfs of Land^ which yield peculiar 
Ferments', fomettmes Vitriolate Earth, fometimes Aioniiaous, 
fometimes Nitrous , fometimes commoo-Saime, healing Bo!us\ 
a^d Earth proper forVnllm^ Tobacco-pipes, c^^;. Sometimes the 
Ferment is fo hot, ^ to hollow the fnrf ace faficr thdn^ can eafily^ he 
• ■ K kkk z aiilifd 
