Vegetahle Staticks. 37 
caufc of it 5 viz^ They frequently obferve 
(efpecially with the refleding Tclefcopes) 
fmall feparate portions of pellucid vapors 
floating in the air 5 which tho’ not vifibleto 
the naked eye , are yet confidcrably denfer 
than the circumambient air : And vapors of 
fuch a degree of denfity may very proba- 
bly, either acquire fuch a fcalding heat from 
the Sun, as will fcorcli what plants they 
touch, efpecially the more tender : An effed, 
which the gardiners about London have too 
often found to their coft, when they have 
incautioufly put bell-glaffes over their Colly- 
flowers, early in a frofty morning , before 
the dew was evaporated off them; which 
dew being raifed by the Sun’s warmth, and 
confined within the glafs, did there form a 
denfe tranfparent fcalding vapor, which burnt 
and killed the plants. Or perhaps, the up- 
per or lower furface of thefe tranfparent fc- 
parate flying volumes of vapors may, among 
the many forms they revolve into, fometimes 
approach fo near to a hemifphere, or herni- 
cylinder, as thereby to make the Sun-beams 
converge enough, often to fcorch the more 
tender plants they fhall fall on: And fome- 
times alfo^ parts of the more hardy plants 
P I and 
