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x. To enquire how the Salt- Pet re is made in India; whe- 
ther by the heat of the Sun or with Fire or both: what 
fort of Earth the Lye whereof the Salt Petre is made 
is extraSed from: how the /aid proper Earth may fa 
known, either by Colour or Tafie or otherwife^ hi what 
Latitude or Climate it mofi abounds • whether it le 
found mofl^ nigh to Rivers or the Sea fide or in Woods 
from the falling of the Leaves, and bow deep in the 
Earth it is to be fearctidfor. 
2. To get a true Account of the whole Operation of Tndico 
from Jamaica^ or elfewhere, the managing of the Plants 
and how raifed, whether by Seed or otherwife, and to 
know the proper Seafon for Sowing if rais'd by Seed, 
and what fort of Soil is required for the fame. 
Some Experiments andObfervations made of the force of 
the prejfureof the Water in great 'Depths , made and 
communicated to tfo Royal Society., by a T erf on of 
Honour. 
jjPril Sth.fl.v: 1680. Being off oi Pant alar ia near 
Sicily in a Calm, I let down a Bottle 70 Fathom 
ftop'd with an excellent good tender Cork, well fitted, 
and bound down 5 and the Cork came up in the Bottle 
I. full of Salt Water: Whereupon making fomeReflefiioa 
on the foftnefs of the Cork, the Bottle was again fitted 
with an excellent good Cork, but of a woodinefs or 
hardnefs as. fome Corks are, with the which, being let 
down in like manner , the Cork continued in its 
place, but as it were bruifed, and the Bottle as before^ 
aboiit I full- of Salt Water. Whereupon I took a good 
Ox Bladder, and bound it four-fold over the mouth of 
the Bottle without any Cork at all, only I putfa piece 
of Leather to keep the Glafs from cutting the Bladder, 
as 
