ef fever al Mines of France, 26 1 



and longer maintained flame, there arlfes to the confumer a 

 faving oF more than a fifth, compared with the uie of either 

 of thcfe taken feparately. It was with this view that the re- 

 porter propofes to fubjed the different kinds of coals in tlie 

 republic to experiences, capable of fixing, in an invariable 

 manner, not only their peculiar ufe in commerce and in the 

 arts, but alfo the advantages which would refult from mixing 

 them in certain proportions. 



Ki 



Xi-i. Mil/Mr 



