SOS On Metallic Sulpfiurels. 



Ironstone^ supposed the logs 

 Clod - 



Coal, mixed with rock 

 Flint coal, or bottom coal 



We see then, that in the first-mentioned coal pit, no coal 

 was found within much less than 30 yards of the surface, and 

 thai then three small layers of bad coal only were gotten: 

 that alter sinking near 24 yards deeper, three other layers, 

 of the same coal were procured, but that tlie iirst vein of 

 good coal lav 92 yards beneath the surface : that this vein 

 was 4 feet thick : that none of the veins appear to have been 

 more than 5 feet thick : and that in 154 yards, and more, 

 reoularly worked, or above 234, taking in the whole expe- 

 riment, 13 yards 2 feet of coal were found. In the second 

 pit specified, the coal appears to have been met with in little 

 more than 21 vards from the surface. One of the veins 

 proved 6 feet thick ; and in sinking somewhat less than 44 

 yards, above 7 yards thickness of coal was discovered. In 

 the third pit specified, the sulphureous or bad coal was met 

 with in 16 yards from the surface, and good coal in less 

 than 28 yards ; no vein exceeded 3 feet ; and the aggregate 

 in almost 68 yards was not quite nine vards of coal. In 

 the fourth pit specified, the first unmixed coal was 50 yards 

 from the surface ; and in sinking above 1 16 yards, it does 

 not appear that here was any vein thicker than 2 feet ; and 

 the ag'iregate of unmixed coal measured only 3 feet 2 inches 

 in thickness. 



[To be continued] 



XXXVI . On MclalUc Sulphurets. By Professor Proust *. 



JSaETAls, savs Bcrthollet, may combine in proportions 

 exceedingly various with sulphur; and the combinationi 

 thev thus form have diiTcrcnt properties, according to their 

 proportions, Sec. Considering the gcueralily with which 

 Bcrthollet establishes this opinion, there is reason to be 

 astonished that he should have neglected to lay before the 

 reader the facts on which it seems to rest. Silver, mercury, 

 platina, copper, antimony, arsenic, lead, tin, bismuth, &c. 



• From J'jiirna! de ?hpi<(ue. 



do^ 



