[ * 7 ° ] 
gave me a (mart fhock, and at the fame time fet 
the fpirits on fire. 
The day following, we wanted to repeat our ex- 
periments ; but as the weather was hazy, and the 
froft had greatly abated, they did not fo well an- 
fwer. However, from making them on feveral 
heads, we found that the ftro.nger the hair, the 
* greater was the effedt ; whereas, loft flaxen hair 
produced little or no fire at all. 
It may not be improper to mention, that thefe 
experiments were made in a warm, dry room, be- 
fore a good fire, and at a time when the thermo- 
meter, in the open air, was at fix or feven degrees 
below the point of congelation. The hair, which 
lucceeded belt, was perfectly dry, and no powder 
or pomatum had been ufed on it for fome months 
before. 
I have the honour to be, 
S I R, 
Your molt obedient, 
and molt humble fervant. 
Patrick Brydone. 
XXI. Some 
