166 = Friedel and Crafts on the Ethers of Silicic Acid. 
0H 
(2.) 1st anhydrid, Si 0 = §1, 0,200, 
OH 
The silicate which Odling calls metasilicate corresponds to this 
hydrate. 
Secondly, with condensation : 
6H 
Si OH 
OH 
(3.) Ist anhydrid, 6 = 2(Si0), 6(OH). 
: OH 
OH 
This hydrate is the type of Odling’s intermediate silicates, 
bodies which it would be better to call disilicates. 
si} gu 
0H 
Si + OH 
OH 
(4.) 2d anhydrid, 0 = 251,20, 4(OH). 
Si 6 
0H 
si{ OH 
(5.) 3d anhydrid, 0: = 28i,3q, 2(OH). 
.{6 
Si} On 
Without giving other formule of possible hydrates, we will 
observe, that the three ethers of Ebelmen would come under 
the case (1), (2) or (4) and (5). Ebelmen does not speak of any 
ether corresponding to the formula (8), but this is the only one 
that we have been able to obtain in a state of purity, and every 
repetition of Ebelmen’s experiment has given negative results, 
in spite of the most persevering efforts to prepare his bisilicate 
and quadrisilicate. 
ee ee ee eee 
