IWDE SZ 
Fraxinella exhales inflammable air, p. 146. 
Fruit. All fruits have a poifonous exhalation by day 
and by night, p. 58.—Poifon common air at all times, 
p- 58. exp. 7§—gt.—Their noxious effect greater than 
that of flowers, p. 59.—Their deleterious effe& checked 
by the fun, p. 60. and by cold weather even in the 
night, p. 288. exp, 87.—Effeét of the light upon fruit, 
- p, 88. exp. 82——87. 
Fulminating air. Inflammable air from metals rendered 
fuch by plants, p. 106, exp. 267, 
G. 
God. His exiftence deduced from the rang rota of 
nature, p. 140. 
Graf. Its air of ee exp. t.—Its air of 
’ the night examined, exp. 36.—Contaminates common 
air by night, exp. 39. ait air of the night and day 
together examined, p. 51. 
Green Vegetable Matter, where to be found in abundance, 
P- gl. .—Difcovered by Dr. Prieftley, p. 89.—Its na- 
ture inveftigated, ibid.—Serves as an index of the rea- 
dinefs of leaves to yield dephlogifticated air, p. 81. 
| H. 
Hrales, (Dr.) his difcaveries on air, p. 111. 
Heat {poils the air of vegetables, p. 11 5.— Even that of the 
fun doe ae wes the — of Bac corse P- 2740 
made, i, 308, Te by-no means the canis of lie 
yielding dephlogifticated air, p. 28. but rather ob- 
ftruéts this operation of the vegetables, p. 292. 
5 Helmont, 
