Combinations of different Metals and Chlorine . 185 
50 grains of it that had been fused were dissolved in water. 
This solution, heated with nitrat of silver, afforded 52.65 grains 
of dry horn silver. Hence 100 of horn lead appear to be 
composed of 
25.78 chlorine 
74.22 lead 
100.00 
As this compound, when decomposed by an alkali, affords 
the protoxide of lead, it may be called plumbane. 
The butter of zinc I have examined, was obtained by eva- 
porating to dryness the muriat of this metal, and by heating 
to redness the residue in a glass tube. This compound is not 
volatile at a strong red heat in a close vessel, it fuses before 
it acquires a dull red heat, and on cooling it goes through 
several degrees of consistency, being viscid before it becomes 
solid. 
This compound, when heated with water, affords a small 
residue of oxide of zinc, which, as in the preceding instances, 
may be considered as in the state of mechanical mixture. 
In consequence of its powerful attraction for water, it is a 
very deliquescent substance ; on this account it is necessary 
to weigh it in water to avoid error. 49.5 grains of it thus 
weighed, dissolved entirely in water, with the exception of 1 
grain of oxide of zinc, which was separated by decantation 
and dried and ignited, and its quantity ascertained to be as 
stated. The solution precipitated by nitrat of silver afforded 
99 grains of dried horn silver. Hence, excluding the 1 grain 
of oxide, 100 of butter of zinc seem to consist of 
B b 
MDCCCXII. 
