I 3 1 * ] 



relation thefe bodies ftand in to each other, and 

 thereby furnifh himfelf with materials for ettablifh- 

 ing a Mineral Syftem, founded on fuch principles as 

 Nature herfelf has laid down in them •, and this in 

 his own iludy, without being forced to have re- 

 courfe to great laboratories, crucibles, furnaces, 

 &c. which is attended with a great deal of trouble, 

 and is the reafon why fo few can have an op- 

 portunity of gratifying their defire of knowledge 

 in this part of natural hiitory. I do not pretend 

 to fay, that the Pocket-Laboratory here defcribed, 

 is in every refpect as perfect as it is capable of 

 being made : and I have in the foregoing pages 

 indicated fome inftances where it is not fuflieient ; 

 yet thole inftances are very few. Befid :s, the 

 ihort time fince it has been invented, and the few 

 perfons that have known how to make ufe of it, 

 are a fufficient apology for its not being brought to 

 the utmoft degree of perfection. It is to be hoped, 

 that the more general its ufe be made, the more 

 and fooner will fuch imperfections be removed, and 

 fuch wants filled up, as will be found nectiTary and 

 convenient. I fnall now add fome hints towards 

 thefe improvements, leaving to the judicious prac- 

 titioner the manner of completing them. 



SECT. LIIL 



A greater number of fluxes might, perhaps, be 

 found out, whofe effects on mineral bodies might 

 different from thefe already in ufe, whereby 

 ore diftincr. characters of thofe mineral bodies 

 ght be difcovered, which now either fhew am- 

 biguous ones, or which are almoft impofTible to 

 try exactly with the Blow-pipe. Inflead of the fal 

 fod<e 9 fome other fairs might be found out, more 

 for thefe experiments. But it is very necefiary 



X 4 not 



