iiger.] ACTION OF SILVEE NITRATE, ETC., ON SILICATES. 83 
This gives the following molecular ratios: 
19Ag 2 0, tNa 2 0, 20Al 2 O 3 , L00SiO 2 , 42H 2 0. 
Combining sodium with silver, we have 
R" 20 Al 40 Si 100 O 280 .42H 8 O. 
Hence the ratio between orthosilicic and trisilicic acids becomes 
10SiO r 30Si 3 O 8 ; 
d combining them under the symbol X, the formula is 
R" Al X 42H = 1-^-2* 2H„0 
Reducing the same way the analysis for chabazite, we have 
R'' 20 Al 40 X 40 .109H 2 O= 1-2-2, 5^H 2 ( ). 
The two form u he are 
Native chabazite R // 20 Al 40 (Si( ),),„( Si :; ( > 8 ) 30 . L09H 2 O. 
Silver chabazite R // 20 Al 40 (SiOJ 10 (Si 3 O 8 ) 30 .42H 2 O. 
Here calcium has been replaced by silver with a loss of three and 
le-half molecules of water. 
The thallium derivatives were prepared with the same lot of chaba- 
te. Two preparations were made, as follows: 
D. Chabazite was heated in a sealed tube with four times its weight 
thallous nitrate, forty-eight hours at 250°-290° C. 
E. Treated the same as D, but heated for sixty-seven hours. 
i). 
E. 
Residue 
found. 
Residue 
reduced. 
Molecu- 
lar ratios. 
Residue 
found. 
Residue 
reduced. 
x 
28.91' 
10.75 
51. 58 
. 65 
.28 
L.30 
2. 85 
8. 54 
36.31 
L3.50 
47.39 
.81 
. 85 
1.64 
100.0 
21 . 8 
18. 4 
2. 8 
1.0 
14.7 
29. 44 
11.11 
52.11 
.04 
. 85 
1.58 
2. 60 
2. 50 
84. 44 
,0, 
13 00 
,0 
-19.01 

.75 
2 o 
.-11 
OH- 
0- 
1.79 
) 5 
the leach water: 
I ALO, 
99.87 
100.00 
100. 28 
None. 
7.09 
1 . 58 
100.00 
CaO • 
Na,0 
1.54 

'•" 
