J. M. Ordway on Waterglass, 187 
curd was pressed, the greater would be the percentage of salt in 
the residue, 
the true constitution of the product in No. 2. The mother- 
liquor in it has just been computed to make up 30°8 p. c., and 
that quantity of mother-liquor accounts for 0-19 p.c. of NaO 
and 05 p.c. of SiO,. After deducting these amounts from the 
Tespective gross numbers furnished by analysis, we find, on car- 
Tying out the necessary calculations, that the net precipitate 
Consists of 89 parts of NaSi,.,, and 25 parts of water. 
0 likewise in No. 3, the mother-liquor is reduced to 48 p.c., 
while 58 parts NaSi,.,, and 87 parts of water make up the fe 
Cipitate proper, And since 58: 37: : 39: 25, the products of No. 
: ie No, are, as they should be, alike in respect to combined 
r. 
by reason of its relation to what Graham calls the ‘colloids,’ has 
