94 



Mr. Griffiths on the 



absorbing air and moisture with such avidity, that it can hardly 

 be removed from one vessel to another, without increasing in 

 weight. This takes place in charcoal from different woods, with 

 various degrees of force ; the second Table shews the increase 

 in every hundred parts of charcoal from thirteen different 

 woods, weighed whilst very hot, and exposed for a week to 

 the above atmosphere. 



Oxide of zinc 



■■ chrome 



iron (colcothar) 



• manganese (black) 

 •lead (litharge) 



• bismuth 



• iron (scales) 

 ■ lead (red) 

 - mercury, by nitric acid 



• copper (black) 



• tin (putty) 



Chloride of silver 



' lead 



Sub. mur. of copper 

 Chromate of lead 



' mercury 

 Sulphate of lime 

 lead 



' — baryta 



■ strontia 



Sulphuret of antimony (liver) 



■ antimony (black) 



— mercury (cinnabar) 



Bi-sulphuret iron 



Phosphate of lead 



Tartrate of lead 



Plumbago 



Carbonate of lead 



— i— zinc (calamine) 



29. 



10. 



8.1 



2.6 



1.7 



.7 



.5 



.2 



.2 



.1 



.1 



.6 



.5 



1.8 



.5 



.1 



16.2 



A 



.3 



.1 



.9 



A 



A 



.2 



.5 



.7 



4.5 



