MM. Friedel and Ladenburg on Oxychloride of Silicon. 451 

 Sixty cells as above, but with zincs carefully") ~q or* 11 



Do. insulated with glass rods, nitrosulphuric" 5 ] 



acid, mercury in cells, &c. Average of >5360 „ 

 nine measures J 



By way of comparison I have taken the following three mea- 

 sures of the light from batteries of the same size in use in 

 London : — 



No. 1. . . 50 cells. 1560 candles. 

 „ 2. . . 50 „ 926 „ 



„ 3. . . 60 „ 976 „ 



These vary greatly, but form, I should think, a very fair 

 average. 



LIV. Chemical Notices from Foreign Journals. 

 By E. Atkinson, Ph.D., F.C.S. 



[Continued from vol. xxxiv. p. 515.] 



FRIEDEL and Ladenburg* have described an oxychloride of 

 silicon. A porcelain tube, either empty or filled with fragments 

 of felspar, was heated to nearly the fusing-point of the latter, and 

 chloride of silicon passed over it. On repeating this operation 

 several times with the liquid which had passed over, and subse- 

 quently rectifying the product thus obtained, it was separated 

 into chloride of silicon and a liquid boiling mainly between 136° 

 and 139°. It resembles chloride of silicon in its deportment 

 with water, by which it is decomposed into silicic and hydrochloric 

 acids. The determination of the chlorine gave numbers for the 

 body corresponding to the formula Si 2 OCl 6 f; this formula is 

 confirmed by the action of the body on absolute alcohol, with 

 which it forms a body called heocethylic disilicate, which had 

 already been obtained by Friedel and Crafts by the action of 

 aqueous alcohol on orthosilicate of ethyle. The constitution of 

 the bodies may be thus written : — 



a fSi(€ 2 H 5 0) 3 A J"SiCP 



u \Si(€ 2 H 5 0) 3 ' **\SiCF 



Another argument for the formula of the oxychloride is its action 

 on zincethyle, with which it yields the body oxide of silicium tri- 



ethyle, Ojg^^s. 



It seems most probable that the oxygen in the compound is 



* Comptes Rendus, March 16, 1868. 

 t 3i = 28. 



