CHEMISTRY: BAXTER, GROVER AND THORVALDSON 73 
The weights given in the tables are converted to the vacuum stand- 
ard by applying the following corrections for each apparent gram of 
substance: PbBrz, +0.000036; PbCla, +0.000060, Ag, -0.000031; AgBr 
+0.000041; AgCl, +0.000071. 
The analyses in the following table were made by F. L. Grover. Two 
preliminary series, one by T. Thorvaldson and one by Grover, gave 
essentially the same result, but since the insoluble residue was not 
determined in these experiments, the details are not given. 
THE ATOMIC WEIGHT OF LEAD 
PbBrz : 2Ag : 2AgBr 
Ag = 107.880 Br = 79.916 
FUSION 
ATMOSPHERE 
GRAMS OF 
PbBr2 
GRAMS OF 
Ag 
RATIO 
PbBr2:2Ag 
ATOMIC 
WEIGHT OF 
Pb 
GRAMS OF 
AgBr 
RATIO 
PbBr2 : 
2AgBr 
ATOMIC 
WEIGHT OF 
Pb 
TTTlr_l_T-T- 
xir>r-pxi2 
5 
27845 
^ 10971 
1 
70124 
907 9^ 
HBr+H2 
2 
65094 
1.55822 
1 
70126 
207.23 
HBr+N2 
4 
08410 
2.40104 
1 
70097 
207.17 
HBr+N2 
4 
97468 
2.92473 
1 
70090 
207.15 
HBr+Nz 
4 
05541 
2.38398 
1 
70111 
207.20 
4 
15017 
0.97717 
207 
18 
HBr+N2 
3 
44139 
2.02288 
1 
70123 
207.23 
3 
52224 
0.97705 
207 
14 
HBr+No 
5 
17387 
3.04158 
1 
70105 
207.19 
5 
29498 
0.97713 
207 
17 
HBr+Nj 
3 
84497 
2 . 26022 
1 
70115 
207.21 
3 
93446 
0.97726 
207 
22 
HBr+H2 
4 
30513 
2.53086 
1 
70105 
207.19 
4 
40616 
0.97707 
207 
15 
HBr+Ha 
4 
53445 
2 . 66549 
1 
70117 
207.21 
4 
64048 
0.97715 
207 
18 
HBr+Na 
5 
78437 
3.40044 
1 
70107 
207.19 
5 
91976 
0.97713 
207 
17 
HBr+N2 
4 
87079 
2.86337 
1 
70107 
207.19 
4 
98467 
0.97715 
207 
18 
HBr+Na 
6 
28446 
3.69447 
1 
70104 
207.19 
6 
43124 
0.97718 
207 
19 
HBr+Ns 
4 
74639 
2.79011 
1 
70115 
207.21 
4 
85708 
0.97721 
207 
20 
HBr+Na 
6 
82424 
4.01148 
1 
70118 
207.21 
6 
98380 
0.97715 
207 
18 
HBr+Na 
6 
53689 
3.84274 
1 
70110 
207.20 
HBr+Br2 
4 
10098 
2.41088 
1 
70103 
207 . 18 
4 
19791 
0.97691' 
207 
09' 
HBr+Br2 
2 
64256 
1.55352 
1 
70101 
207.18 
HBr+Bro 
6 
30683 
3.70718 
1 
70125 
207 . 23 
Average 
1.70111 
207 . 20 
0.97715 
207 
18 
' This result is omitted in computing the average. 
Since the result of these analyses of lead bromide is even higher than 
that obtained by Baxter and Wilson, lead chloride also was investigated 
anew by essentially the same method as was used in the work with the 
bromide. The chloride was finally dried by fusion in a current of hydro- 
chloric acid gas. 
In preliminary experiments to our surprise a basic salt precipitated 
during the solution of the lead chloride in hot water, as soon as a very 
considerable proportion of the salt was dissolved, although a similar 
phenomenon was never observed in the earlier research upon the chloride. 
