( 468 ) 



The sp. gr. of the crystals is 1,190 at 16°; the equivalent volume 

 154,62. Topical axes y^.r^-.w^ 6,0956 : 7,9182 : 4,7399. 



Hydrazo-Benzene. 



Ce H, . NH— KH . C„ H^ ; melting point : J 25° C. 



•-^^ 



Fig. 2. 

 (Hydrazobenzene). 



When recrystallised from a mixture of alcohol and ether, the com- 

 })0und forms small, thin, colourless, square plates. 



Rhombic-bipyramidal 



a:h:c = 0,d787 :i : 1,2497. 



Forms observed : c = |001|, strongly predominant and \ery lustrous ; 

 r>r=|lljj, sliarply reflecting; (j^\()21\, lustrous, always very small 

 developed: to = |221|, narrow; ?«= |110| very narrow and often 

 \vanting altogetlier. Thin-tabled towards c. 



Measured : Calculated : 



C:0 =r (001) : (HI) =* 60°46' — 



0:0 = (IJl) : (111) =* 75 14 — 



c:r/ =(001):^021)= 68 11 68^12' 



o.w=:(lll):(221)= 13 45 13 36 



tü:m = (221): (110)= 15 27 15 38 



c : m = (001) : (110; = 89 56 90 



oi:oy= (221) : (221) = — 84 41 



m : m = (110) : (1Ï0) = 88 36 88 46 



«) : a> = (221) : (221) = 30 58 31 16 



Very completely cleavable along |001|. 



On c the situation of the directions of extinction is orientated 

 towards the side c : 7. An axial image could not be observed. 

 Sp. gr. = 1,158 at 16' C; the equivalent volume is 158,89. 



Topical axes : -/ ■ ^' ■ io = 4,9567 : 5,0645 : 6,3291. 



