1 86 Misce/ianeous Inieiligence. 



This mixture should be carefully luted in a Hessian crucible, 

 and remain 30 hours in the fire. 



Amethyst. 



Paste ,, 4608 



Oxide of manganese .... * 36 



Oxide of cobalt 24 



Purple of Gassius 1 



Beryl, or Aqua Marina. 



Paste 3456 



Glass of antimony 24 



Oxide of cobalt 1| 



Syrian Garnet, or Ancient Carbuncle. 



Paste 512 



Glass of antimony 256 



Cassius purple 2 



Oxide of manganese 2 



In all these mixtures, the substances should be mixed by 

 sifting, fused very carefully, and cooled very slowly, being left 

 on the fire from 24 to 30 hours. 



M. Lan9on has also made many experiments on the same 

 subject. A few of his proportions are as follows : 



Paste. 



Litharge , 100 



White sand „ 75 



White tartar, or potash 10 



Emerald. 



Paste 9216 



Acetate of copper 72 



Per-oxide of iron, or saffron of Mars 1.5 



Amethyst. 



Paste , 9216 



Oxide of manganese from 15 to 24 



Oxide of cobalt 1 



15. Spontaneous Combustion of Cloth. — About twenty-five 

 pieces of cloth, each of which contained nearly thirty ells, 



