3" 



[ m ] 



heat occafioned by this, is very intenfe, and the 

 mineral bodies may here be burnt, calcined, melt-* 

 ed, or fcorified, &c. as well as in any great works. 



SECT. VIII. 



The Blow-pipe is in common ufe among jewel- 

 lers, goldfmiths, fome glafs-blowers, &c. and has 

 even been ufed a little by the chemifls and mine- 

 raliftsj but, to the beft of my knowledge, Mr, 

 Cronftedt is the firft who made luch an improve- 

 ment in its ufe, as to be employed in examining 

 all mineral bodies. This gentleman invented fome 

 other apparatus, neccffary 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 

 on travels, might be called a Pocket- Laboratory : 

 And as neither this Pocket Laboratory, nor even 

 the extenfive ufe of the Blow-pipe, is yet generally 

 known, I think it will not be altogether ufelefs, to 

 give a defcription 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 time: If this globe was not 

 there, the vapours would go directly v/ith the 

 Wind out into the flame, and would thereby cool 

 the affay. 



The hole in the fmall end b. through which the 

 wind comes out, ought not to be larger than 

 the fize of the fined wire. This hole may now 

 and then be flopped up with fbmething coming 



T 4 into 



