[ 3*o ] 



fend melted again with frelh borax, until it fhews 

 the blue colour. 



SECT. LI. 



Nickel is very feldom to be had, and as its 

 ores are feldom free from mixtures of other metals, 

 it is very difficultly tried with the blowpipe. 

 However, when this femi-metal is mixed with iron 

 and cobalt, it is eafily freed from thefe heteroge- 

 neous metals, and reduced to a pure nickel regulus 

 by means of fcorification with borax, in the fame 

 manner as is mentioned Seel:. 1. becaufe both the 

 iron and cobalt fooner fcorify than the nickel. 

 The regulus of nickel itfelf is of a green colour, 

 when calcined : it requires a pretty ftrong fire be- 

 fore it melts, and tinges the borax with a jacint 

 colour. Manganefe gives the fame colour to borax, 

 but its other qualities are quite different, fo as not 

 to be confounded with the nickel. 



SECT. LII, 



Thus I have briefly defcribed the ufe of the 

 Blow-pipe, and the method of employing it in the 

 ftudy of Mineralogy. Any gentleman who is a 

 lover of this fcience, will, by attending to the 

 rules here laid down, be able in an eafy manner to 

 amufe himfelf in difcovering the properties of thofe 

 works of nature which the mineral kingdom fur- 

 nifhes us with. The hufbandman may by its help 

 find out what forts of ftones, earths, ores, &c. 

 there are on his eflate, and to what ceconomical 

 ufes they may be employed. The Scientific Mi- 

 neralift may, by examining into the properties and 

 effects of the mineral bodies, difcover the natural 



relation 



