392 PHYSIOLOGICAL REMAINS. 



melt, may be a mixture for glass, and may make it 

 more tough and more crystalline. Besides, we see 

 metals will vitrify ; and perhaps some portion of the 

 glass of metal vitrified, mixed in the pot of ordinary 

 glass-metal, will make the whole mass more tough. 



For the third ; it were good to have of coloured win- 

 dow glass, such as is coloured in the pot, and not by 



colours 1 



***,* 



It is to be known of what stuif galletyle is made, and 

 how the colours in it are varied ; and thereupon to con- 

 sider how to make the mixture of glass-metal and them, 

 whereof I have seen the example. 



Enquire what be the stones that do easiliest melt. 

 Of them take half a pound, and of iron a pound and a 

 half, and an ounce of brimstone, and see whether they 

 will incorporate, being whole, with a strong fire. If 

 not, try the same quantities calcined : and if they will 

 incorporate, make a plate of them, and burnish it as 

 they do iron. 



Take a pound and a half of brass, and half a pound 

 of iron ; two ounces of the calaminar stone, an ounce 

 and a half of brimstone, an ounce of lead ; calcine them, 

 and see what body they make ; and if they incorporate, 

 make a plate of it burnished. 



Take of copper an ounce and a half, of tin an ounce, 

 and melt them together, and make a plate of them bur- 

 nished. 



Take of copper an ounce and a half, of tin an ounce, 

 of glass-metal half an ounce; stir them well in the 

 boiling, and if they incorporate, make a plate of them 

 burnished. 



1 Here something is wanting in the copy. Note by Tenison. 



