66 JOURNAL OF THE 
dissolved in 2°° of pure dilute nitric acid, which was then 
partly neutralized with ammonia. Ammonium acetate 
was added and 10° cf chromate solution as before, and 
after standing, the precipitate was filtered on a Gooch 
crucible and weighed as BaCrQ,. 
‘The filtrate trom the barium precipitation was con- 
centrated somewhat, and calcium and the small quantity. 
of strontium precipitated as before. They were ignited 
and weighed as oxide. Strontium was then separated 
by treatment with amyl alcohol and determined as sul- 
phate. 
Tahe alkalies were determined bya Smith fusion 1 in the 
ordinary way. 
The results of the analyses are as follows: 
I. i; Average. Ratio. 
53 8 SOBRE gh 04 44°11 43°86 i fok — 3°00 
AS ie os ee 24°89 24°96 W44 ea 
6 aa |. oh bo tbe 4 i FAR VE Be 
» AG nas ASB 1.180 F298!" -O1 41 
1 @ eae oe 2 a 5°84 21 5380 "10 Fe) ge 
MgO . 0-61 062 60:62 “015 (i440 ae 
ie Reale eee 3°40 3°40 ‘030 | 
ie ee 1°80 1°80 029 | 
(Fi © aerate: 96,9 13,39 4) dagas *742 = 3.04 
100°01 
The ratio of SiO,: Al,O,: RO: H,O is very close to 
3.:1:1:3, which gives the formula R”’A1,Si,0,,.. 3H,0% 
The ratio of BaO : CaO : K,O+Na,O in the above analy- 
ses is nearly 1:3:2 and the theoretical composition cal- 
culated fer this ratio is given below together with the 
analysis after substituting for Na,O its equivalent of K,O 
and for MgO and SrO their equivalents respectively of 
CaO and BaO and then recalculating to 100 per cent. 
