268 APPENDIX. 
tp be reflcfited without aftually touching the 
reflefting Body in the Point of Reflettion ; fo 
it is not unreafonablc to Tuppofe, ' that elaftic 
Air may like Light be diverted from one Courfe, 
and fo be determined to another by the folid 
Bodies it approaches without touching them, 
but rebounding like Light from thofe folid Bo- 
dies near the Point of Contad. 
2, I obferve that thefe Spirals are coiled in 
a Courfe oppofite to the Courfe of the Sun, 
‘viz^ from Weft to Eaft. 
5. I have feveral times obferved, that when 
the Fumes of burning Brimftone have afeend- 
ed among the Leaves of a Tree, thofe Leaves 
have very foon withered ; and that, not by 
any fcorching Heat of thofe Fumes, for the 
burning Brimftone was at too great a Diftance 
to have that FtFed j whence it feems probable 
that thefe Fumes fix and deftroy the Flafticity 
of fome adivc elaftic Principles in the Leaves : 
And §lu, may not fome Blafts be owing to 
the like of Volumes of fulphureous 
Vapours which may float in the Air? 
E X P E R I 
