310 Friedel and Crafts on the combinations of 
operating in this way on considerable quantities of materi 
boiled at 152°. 
The method of purification with sulphuric acid was not at 
first adopted, and the analyses made of the substance boiling at 
about 152°, after it had been simply treated with water and with 
caustic potash, in order to remove traces of chlorid of silicon, 
gave a slight excess of carbon for the first portions which dis- 
tilled ; see analysis I This was undoubtedly due to a minute 
phe of a hydrocarbon, probably ethylene, dissolved in the 
beat 
rid of calcium. The product, which was finally obtained a 
Analysis of the liquids, which had not been treated with sulphuric acid. 
L Boiling point=151°-1514°, 
ubstance taken=0'1863 grammes; CO,=0°4520 grammes; 
H, O=0°2280 grms, | 
Il. Boiling point=1511°-153°. 
Substance taken=0-1743 grms. ; CO, =0°4127 grms. ; H, O= 
0:2170 grms. 
IIL. Same product redistilled. Boiling point=1511°-152}°. 
Substance taken=01948 grms.; CO,=0-4685 grms.; H,0= 
0-2390 grms. 
£ I. Ir. Calculated for Si(C:Hs)s 
C6718 65°93 65°77 66°67 
H=13°60 13°83 . 13°67 13°89 
Analyses of silicic ethyd purified by a treatment with sul- 
phuric acid. Boiling point=152°-153°. 
IL igen taken=0-2192 grms. ; CO,=0°5358 grms. ; H, O= 
: ts, 
HL Substance taken=0-3015 grms, ; SiO, =0°1250 grms. 
IV. Substance taken=0-3430 gris. ; SiO, =0-1395 grms. 
