206 
PROCEEDINGS OF THE NATURAL [APRIL, ’89. 
gms. and having a specific gravity of 2.71. Traces of Pb. 
were present. The amount was decreased by remelting 
in the air. Three buttons of an alloy of A1 and Sn in 
the crucible containing the Sn cathode, together weighed 
4.46 gms., having a sp. g. of 4.69. This would indicate 
that the alloys contained about 43 per cent, of Sn and 55 
pei cent, of A1 which would approach the formula Air, 
Sn. There seemed to be little metallic A1 present in the 
SnNa alloy. The liquid was agitated several times dur¬ 
ing the electrolysis with a carbon rod. The PbXa alloy 
contained some Al. which could be precipitated as hydrox¬ 
ide of Al from the aqueous solution of the alloy bv neut¬ 
ralizing with acid. 
Experiment 3. In another experiment I passed a cur¬ 
rent, having an average of 54 amperes and 10 yolts, for 
0.5 hours, through a mixture of 1 part cn r olite and 5 
parts NaCl m a. single crucible having 370 gms. Pb as 
cathode. Upon opening the crucible 25 gms. of Al in 
free from Pb and Na. were upon the top 
° e bNa alloy. This Al had a specific gravity 2.67, 
and contained some iron and silicon from the cryolite and 
,, , . ' le ' er - A brilliant PbNa alloy contained some 
could , 1Ch T ” 0t be extracted by heating in air, but 
could be obtained by heating under NaCl ' 
less thanTh n ^° f ^ PrCSent Was 120 g“s.; not much 
a cu ^nt ^ This was produced by 
which N e 10 V ° lts working 5.5 hours. 
hourJ CqU1Valent t0 ° ne electrical horse power for four 
having oOO grnt of p”, ^ CXperiment with two crucibli 
80 amperes, for four hours" and ”alt & CUrmlt ' 
NaCl ^ ’ a i 1 to 5 of cryolite an 
ules, and in the other^imAl 4 ^17' ° f A1 in sma11 gM 
Na alloy formed. It i s thus's " ’T & “ the ? 
^een that the Pb must a< 
