1024 Dr. ingenhousz on the Lighting a 
The farina lycopodti may be ufed for the fame pur- 
pofe, but it is not fo good as the powder of refin, becaufe 
it does not take fire quite fo readily, requiring a ftronger 
fpark not to mifs ; befides, it is foon burnt away. 
By dipping the cotton in oil of turpentine, the fame 
effedt may be as readily obtained, if you take ajar fome- 
what greater in fize. This oil will inflame fo much the 
readier if you flrew a few fine particles of brafs upon it. 
The pin dull is the belt for this purpofe; but as this oil 
is fcattered about by the explofion, and, when kindled, 
fills the room with much more fmoke than the powder 
of refin, I prefer the laft. 
This experiment may be made ufe of for lighting a 
candle in the night as well as in the day. But for this 
purpofe a charged phial fhould always be kept in readi- 
nefs, and placed where it may be eafily found in the 
dark. The jar for this purpofe fhould be furnifhed in the 
manner invented by Mr. c av allo, with a glafs tube at the 
in fide, reaching from the mouth of the phial to the bot- 
tom, through which tube the wire which eflablifhes 
the communication with the inward coating pafles, 
which, as foon as the phial is charged, is to be taken 
away, by holding it by the piece of fealing wax, or glafs 
red covered with fealing wax, fattened to the knob of 
z the 
