448 Intelligence and Miscellaneous Articles. 



graphed. Parallelepiped's and right octahedra, which appear to 

 belong to the cubic system, are readily distinguished. 



The determination of the pressure under which the solidification 

 takes place at different temperatures presents some difficulties ; 

 the liquid is warmed by the compression, it must be compressed 

 slowly, and the moment of crystallization is more difficult to hit 

 upon. The inverse phenomenon taking place with diminution of 

 pressure, we obtain a pressure of fusion and a pressure of solidifi- 

 cation, the interval between which is made as small as possible and 

 the mean taken. 



I have thus found that chloride of carbon solidifies : — 



At — 19°-5 under a pressure of 210 atmospheres. 



0° „ „ „ 620 

 „. 10° „ „ „ 900 

 „ 19°-5 „ „ „ 1160 



I have made one experiment with protochloride of carbon (C 4 C1 4 ) ; 

 at 0° it is not solidified under a pressure of 900 atmospheres. 



I have likewise examined benzene, which, at 0°, solidifies under 

 the normal pressure; but an accident having interrupted these 

 researches, I have only been able to prove that at 22° it crystallizes 

 in beautiful feathers under a pressure of about 700 atmospheres 

 (approximate). 



The question arises whether there is not, for each liquid, a tem- 

 perature above which solidification cannot take place under any 

 pressure, that is to say a critical temperature of solidification, in 

 the same way that there appears to be a temperature below which 

 the body remains solid under the feeblest pressures. This I must 

 leave for further investigation. — Comptes Rendus, July 18, 1887. 



ON A NEW VOLTAIC BATTERY. 

 BY F. FRIED ERICHS IN STUTZERBACH. 



The novelty in this battery consists in the mode of filling and 

 emptying the exciting liquid, by an arrangement met with in some 

 forms of apparatus for generating sulphuretted hydrogen. A series 

 of tubulated bell-glasses, supported with their necks downwards, 

 are connected by means of caoutchouc-tubes with a horizontal glass 

 tube containing as many tubulures as there are glass vessels. One 

 end of this horizontal tube is connected by means of an india- 

 rubber tube with a tubulure in a large glass reservoir containing the 

 exciting liquid. This vessel can be raised or lowered to any 

 desired extent, and thus the cells can be filled to any height or 

 can be emptied. The emptying is facilitated by a stopcock in the 

 other end of the tube. 



If it is wished to use a smaller number of cells the india-rubber 

 tube connecting the cell and the horizontal tube can be clamped by 

 a stopcock. — "Wiedemann's Annalen, No. 9, 1887. 



