Chemistry and Physics. 483 
ter and the whole is immersed in mercury. On_ heating this 
meet, the thermometer —_ watched, a point is reached at 
105°0°, mercuric chloride at 258°3° sini sodium nitrate at Sugg is 
m. Soc., xli, 111, March, 188 
2. On the o “itical aap ‘of Organic Licute we 
LEWSKI has given the results of an extended investigation of the 
critical tnipotasties of pees liquids. He finds, (1) that the 
critical temperatures of homologous compounds differ from their 
boiling points by a poset quantity; (2) that isomeric ethers 
have the same or very nearly the same critical temperatures; (3) 
ee. pais (4) that the critical temperature T,, of a mix- 
tw uids can be expressed by the formula T,, 
nT 100-n)T" 
HE oo in which m and 100—n are the percentages of the 
constituents and T and T’ their critical temperatures; (5) th 
the above formula gives the means for determining the er vitical 
are known, 
critical temperatu f the less volatile constituent, that of the 
more volatile one is obtained by transposing the formula T’= 
100 T,.—nT 
Pinan: 
volatile liquids can be obtained from the same formula, provi 
the critical raha of the mixture and of each constituent is 
known, since n—100( ,"--). Owing to the facility with which 
(6) that the percentage composition of mixtures of 
water attacks glass at high temperatures, the action beginning 
even at 240°, the author has not been able to fix very accurately 
the critical temperature of this liquid. Beg Berl. meee phi 
Xv, 460, sabi ge 
Carbon ay SEY a and Vase pe 
n be : 
by recrystallization from ether. Alcohol also eonlbe the erystal- 
lization. The new body is thus obtained in the 
i w 
bright rismatic crystals—or if slo zs separated, of rhombic 
lee having the composition C.S,Br,, r carbon tri 
ide. It fuses at 125° to a red liquid eer 
