328 Friedel and Crafts on the combinations of 
= nitric acid and heated for forty hours at 250°-300° and 
obtained the following result : 
Substance=0°2330 grms. ; SiO,=01405 grms. 
i= 29°85 p.c. calculated =81°81. 
result is complciely in accordance with the vapor density deter- 
mination made by Gay Lussac’s method. 
Substance employed=0°1813 grms. 
Temperature of the bath 100°. 
Height of the barometer 751-7 m.m. at 8°. 
Volume occupied by the vapor 85 c.c. : 
Height of the mercury in the measuring tube 194 m.m. 
Vapor density by experiment =3°'058 
Vapor density by calculation =3°045 
If the silicic ethyd represents the hydrid of silico-nonyl, the 
silicic methyd is the hydrid of silicopentyl, SiC,Hy, or the 
silicated substitution product of the hydrocarbon of the amylic 
alcohol series. 
The want of material has prevented us from carrying the 
study of this body farther; we will only call attention to the 
great difference in the boiling points of theses homologous 
silicated hydrocarbons. 
Silicic ethyd boils at (152° _—_ centigrade. 
Silicic methyd “ 30°- . 
Difference =. 122°5 » 
This difference corresponds to 30° for each increment of 
CH, and is quite at variance with Kopp’s law. This fact is the 
oc Stuicic Ernyp anp Meruyp. 
It is obvious that considerable interest attaches to the com- 
ction of the series of the silicated hydrocarbons, of pir | 
escribed the members corresponding to the pentyl 
y* group, and it appears probable that all the inter 
