312 Prof. Horsford on the Permeability of Metals to Mercury. 
ei * Tee Pre IS oli : .* GOs 
Mercury; =". ad : ; 3°63 
! 99-95 
IL Another analysis of the same gave of 
Lead, . é 96°39 
Leaving of mercury, 3°62 
: | 100-01 
I. An analysis of the bar after seven months exposure to the 
atmosphere, gave of | 
“Mercury, _ . ¥ ads pew O83. per cent. 
_. Leaving of lead, . Pe <7 MA 
| 100-00 
Il. Another analysis gave of © , 
Mercury, | ‘ ‘ ‘ . 068 
Lead, . : ic . 99:22 
: 100-40 
two percent. 'T'he lead was determined in the second case as 
sulphate. 
_X. What is the constitution of the amalgam which flows 
through the bar? 
_ An analysis gave by precipitation of the sulphate of lead from 
the nitric acid solution, in 
27348 gr. of amalgam, 
_0°1008. of sulphate of lead, 
leaving 97-48 per cent. of “mercury. 
An analysis of the solid crystalline amalgam, which formed 
about the bar, when in contact with the mercury gave 0: 
t =2:52 per cent. of lead, 
Lead, ‘ , . 36-03 per cent. 
Mercury, é Z r 63-97.“ ‘“c 
~ 100-00 
A cast bar, the surface of which was not scraped, after a little 
time lost no more of its mercury as the following weighings 
show, 
