25o appendix. 
of Plants, is very probable from fome Ob- 
fervations that Mr. Beighton^ F. R. S. and 
himfelf rriade upon the Engine taraife'Wa- 
ter by Fire, whereby it appeairs that the 
Steam or Vapour of boiling Water is rarer 
than Water from which it was produced, 
above 13000 times, when its Elafticity is 
equal to that of common Air, Phtlof, Tranf. 
No. 398, 
I. ROM the Influence the Sun had on 
the fixth Thermometer, at two Feet 
Depth under Ground^ fo as to raife the Spi- 
rit in it to thirty one Degrees in Experiment 
XX. p. 64. we may hence fee the Rea- 
fon why when Cellars whofe Walls, or the 
Crowns of their Arches are immediately ex- 
pofed to the Sun without any Shelter, they 
will feldom keep Wine or other fpirituous Li- 
quors well, viz. becaufe they are thereby too 
much heated. 
1. 1 have alfo obferved from thofe Ther- 
mometers which were fixed at feveral Depths 
under Ground ; that when in March the Sun 
has (liined bright all Day, it has had a confi- 
Observation IV. 
derabls 
