CONTENTS. 



Ixv 



Se&. XVIII. Leaves of plants die fooner whenthe 

 dsphloy.fi cat ed air, elaborated by them, is 

 fepar at ed from them, p> 71 



XIX. On the power which vegetables have of 

 abforbing different kinds of air^ 77 



XX. On the beji manner of judging whether the 

 plants arc ready to field their dephlogifiicated 

 air, 79 



XXL Conjecture, why fome waters, as diftilled^ 

 boiled, and fome others, do not promote, but 

 obfirutl, the operation of plants in yielding de- 

 phiogiflicated air, g 3 



XXI I. Some remarks on the green matter, which 



fettles at the bottom and fides of the jars, in 



tvbich the zvaier is left f landing, 89 



XXI ll. In planting trees for rendering the air 

 wholcfomcr, it perns not to be quits indiffe- 

 rent what kind of trees are made ufe of, 92 



XXIV. "Tie largeft and the more perfect leaves 

 yield more and purer dephlogifiicated air than 

 thofe which are net yet full grown, 95 



XXV. Though the diminution of the bulk of 

 nitrous end common air is believed to be an wi- 

 quejiionable tejl of the goodnefs of any air; 

 yet it muft be allowed, that in fome hinds of 



air this teft may fail, 97 



^IXVl. Air is ore of the moft changeable fub- 



fiances in nature, and appearing under very 



different forms from a variety of caufs, icy 

 XX VII.' On the nature of the air oozing out of 



our skin, 129 



(hmla/hn. 1 37 



e Part 



