[ 3 
Heat occalioned by this, is very iritehfe, and the 
mineral bodies may here be burnt, calcined, melr^ 
€d, or fcorified, &c. as well as in any great works, 
SECT. Vllt. 
The Blbw-pipe is in common life among jewel- 
lers, goldfmiths, fome glafs-blowers, &c. and has 
even been ufed a little by the chemifts and mine- 
ralifts ; but, to the beft of my knowledge, Mn 
Cronftedt is the firft who made Inch an improve- 
ment in its ufe, as to be employed in examining 
all mineral bodies. This gentleman invented fome 
other apparatus, neceffary in making the expe- 
riments, to go with the Blow pipe, which all 
together make a neat little cafe, that, for its 
facility of being carried in the pocket, particularly 
bn travels, might be called a P o eke t -Labor at ory 
And as neither this Pocket Laboratory, nor even 
the extenlive ufe of the Blow-pipe, is yet generally 
knovin, 1 think it will not be altogether ufelefs, to 
give a defeription of it, 
SECT. IX. 
The Blow-pipe, is reprefented in its true figure' 
and fize. Tab. i, fig. i. The globe a is hollow, 
and made on purpofe to condenfe the vapours, 
which always happen to be in the Blow-pipe when 
it has been ufed fome titne : If this globe was not 
there, the vapours would go direclly with the 
wind out into the fiame, and would thereby cool’ 
the aifoy. 
The hole in the fmall end b. through which the 
wind comes out, ought riot to be larger thari 
the fize of the finefi: wire. This hole may now 
i^nd then be flopped up with fomething coming 
T 4 into 
