Benzylaniline. 



( 469 ) 



Cb e, . GH,— NH . C„ H, ; niellin^ point : 36i° O. 



Fig. 3. 

 (Benzyl-Aniline). 



From ether or alcohol the compound crystallises in large colourless 

 crystals flattened towards a which, hoAvever, ne\'er exhibit measurable 

 end planes. The best crystals are obtained from methyl alcoiiol. They 

 are tiien mostly twins towards |J00| or sometimes parallel-crystalli- 

 sations. The end [)lanes are generally curved ajid unsuitable for 

 measurement. With some of the bettei- developed crystals more 

 accurate measurements could be executed. 



MonocUno-prisiaatlc. 



a ■.h:c = 2,101^:1 : 1,6422. 



,?=76°36i'. 



Forms observed : a = |100|, most broadly developed of all and 

 strongly lustrous ; c = |00i|, somewhat narrower and strongly lustrous; 

 .y :=z |021|, bent and curved, sometimes less opaque and flat ; r = |203|, 

 well developed and lustrous; w = |24 2 1|, indicated as extremely 

 narrow vicinal form, mostly wanting. 



Measured : Calculated : 



a:c = (100) : (001) =* 76°36V; — 



a:;- =(100): (203)=* 73 317, — 



c : .5 = (001) : (021) =- 72 377, — 



s:s= (021) : (021) = 34 45\/, 34°457,' 



a:s z= riOO) : (021) =: 93 58 93 58 



r:s = (203) : (02Ï) = 75 1 74 597, 



c : r =z (001) : (203) = 29 53 29 52 



Very completely cleavable towards |001| and |100|. Twins 

 towards |100|. 



In the zone of the />-axis orientated extinction everywhere; the 

 optical axial plane is |0J0;. Oji (t and c a black hyperbola is visible 

 in con\ej-gent light ; one axis forms with the normal on a an angle 



