184 J, M. Ordway on Waterglass. 
vated or by ieales, It is also soon deposited from a solu- 
taken up by a stronger acid. These precipitates are, by no 
means, of the same com osition, thoug they often aie 
24, Some purified stannate of soda that had been dried | in ite air and 
then kept in : well stopped bottle for two years, on being treated Me 
ten times its weight of cold water, left undissolved one twenty- -third 
the tin, combined with soda enough to make NaO. 3 
‘7S8n0,. 
The clear liquor, by standing several weeks, let fall one-seventeenth ofA 
4°78n0,. 
its tin as NaO. 4 
__ 25, A ten per cent solution of normal stannate being kept 34 days, 
deposited one-twelfth = the oxyd of tin in combination with enou ough 
alkali to make NaOQ. 
26. A ten per cent ee of NaO.SnO,, was boiled a few moments 
and let fall one-sixteenth of its tin with some eer forming NaO. 
5Sn0g- 
27. A solution containing five per cent of pure stannate, by boiling 
nth o ‘7Sn 
ited one-seve { the tin as NaO.5 
28. Boiling a two per cent solution of Wad, Sn0, caused the precipi- 
tation of over Fobeihied of the tin and enough soda te make NaO. 78009 
.. 29 A one et cent solution of pure stannate of soda required long boi 
ing to make a decided SA sh and the clear liquor filtered out ‘of the 
bulky product. very slowly. The well drained gelatinous residue was 
hire, aa Golited of NaO.7:5Sn0,. It contained over one 
0 
30. A solution containing 1-1 p.c. of NaO.SnO, and 3 p.c. of NaCl, 
being boiled five m minutes, gave a dense, opaque precipitate very easy 10 
i = and press. It contained one-fourth of the tin and Ye 
al * 
The addition of chlorid of sodium and been, boiling causes 
precipitation in a pation: containing no more than 0-1 p.c. of normal, 
stannate of ee 
So far as is known at present, there is nothing to show that 
any one of thes metastannates more than another is entitled of 
