(479 ) , 
terthis, r put water upon the leaves, to fee wkther this Air 
came from thence, and 1 faw indeed foon after, that rhefe bubbles 
began CO ceafe ; and having taken away the waier wherein the 
leaves werej, I faw that the bubbles began again to ifTue out at the 
tail as before : And I faw them//'// come out 24 hours aficr, but 
in little quantity 5 and at length they quite ceafed. DurlDg tliefe 
24hoursthe Roots did lengthen about four lineSj that is^ one 
third of an Inch ; which is a li ttle lefs than they ordinarily do in 
cheAir. 
I kept the Plant in this condlLion for four d-aies upon the Engin^ 
and took care from time to time to draw out the Air that entred 
into it by the leaves ; and then it began to wither , and the Roots 
£hoc no more. 
Another time I put two twigs of Baulme , each into, a Vial full 
of water, and at the end of five daies. when I faw manifeftly that 
they both (hot RootSj-I included in the vacuum that of the tv\o 
which had the l9ngeft roots, without taking it out of ics Vial. 
Ac the end of three dares, obferving that it was wiiher'd mvacuo^ 
I took it out, and changed the Vials of the twiggs, to fee, whether 
that which had remain'd ^>^^^^/y, and did thrive very weli in 
common water, would alfo thrive in water freed of Air; and 
whether that w^hich was wither'd in vmio^ would revive in the 
common water and in Air. Four days after I found the twigg 
that had been in vacuo quite fpoiled, and the other ftill verdant ^ 
but noc tbriving ; and I obferv'd, that it did not begin to fliooc 
in the water freed of Air till ten daies af.er it had been pus 
in. 
This ;^xperiment drew another after it^ to know, whether 
the water purged of Air were lef> fit than common water to make 
plants vegetate. For this end I took two Vials full, the one of 
water purged, the oiher of common water, and having put a 
twigg of Baulme in t^ch, I left them both in the Air. I fuund 
that the twigg in the common watrer fljoc at the end of fix daies , 
and in water purged fiioE this time neither but ten daies 
after it had been put in, 
I repeated this Experiment once more, and I was much furpri- 
zed to fee, that the twigg in the water freed of Air begun this time 
to fiioot the third day, and;the other in the common waier, ftill 
Vat fixch day» But this v/as remarkable herein, that the twigg in 
