907 
CdO appeared always to volatilise in an appreciable quantity, 
the preparation of products of the right composition thus being highly 
impeded. In the ease of the ortho-silicate, a beginning of layer- 
formation could be observed; however the layers disappeared finally 
after repeated melting. 
Finally we found by analysis of the product: 
For Cd05 32,1 9%) 7055’ calculated':-31,96 °/: 
oe COLOR 2 68,04 °/, 
For Cd,Si0, 19,7 Ors d US Ca 
80,2 °/, CdO; 5 80:99 
The ortho-silieate thus may not be considered to be completely 
pure, containing about 0.5°/, SiO, too much; because of the very 
rapid evaporation of CdO at 1400° C. however, it will only be 
accidentally possible to obtain a 100°, Cd,SvO, in this way. 
For CdSiO, we determinated in a series of successive experiments 
(with thermoelement //) the B. M. F. at the meltingpoint to be 
12435 + 5M. V. (uncorr.). After correction this can be fixed at: 
12426 + 5M. V., corresponding to 1241° + 0°,5 C. 
On cooling we found, after undercooling to 12240 M. V., a soli- 
difying-point at 12285 M. V., i.e. at about 1229° C. 
Experiments with the use of the quenching-method in mercury 
were also made; we found, that: 
After heating at 12480 M. V. and quenching, all was glassy. 
je e ,, 12460°M. V. »,, =f RR 5 
is Ps SA 5ORM. Va > . there were crystals 
and glass present. 
N EA Rl EE ORM Ven ” ., a idem. 
The meltingpoint must therefore be situated at about 12455 M. V., 
(uncorr.), which after correction corresponds to 1248° C. 
The crystallised product consists of beautiful, but irregularly 
bordered crystals with parallel extinction and strong birefringence. 
The refractive indices were both greater than 1,759; but the lack 
of liquids with higher refractive index made a more accurate 
determination momentaneously impossible. 
The specifie gravity of the molten and then solidified CaSO, 
was: d,o = 4,928 at 25° C. 
For: Cd,SiO, we found in the same way: E. M. F.=—= 12460 + . 
+ 10 M. V., or, after correction (— 10 M. V:):1242° + 1° C; this 
meltingtemperature being practically identical with that of the meta- 
silicate. 
In cooling a heat-effect was observed at 12280 M. V., i. e. at 
