( 128 ) 



Measured : Calculated : 

 a:p = (100) : (llOj =* 57°55' — 



a : m = (100) : (120) = 38 31 38^34^ 



a:c= (100) : (001) =: 90 4 90 O' 



m -.p = (120) : (nO) = 19 34 19 24 



p'.j) = (110) : (ilO) = 64 10 64 10 



2):b= (110) : (010) = 32 10 32 5 



Completel}- cleavable towards |001| and towards jlOOj. 



Orientated extinction on all planes in the vertical zone. The optical 

 axial plane is jOOlj with a as acnte diagonal. The axial angle is 

 small, the dispersion fair with Q^ v around the «-axis. 



The sp. gr. of the crystals is 1,251 at. 19^ ; the equivalent 

 volume 120,7. 



2. Methyl-Phenylcarbamic Methyl- ester. 



CeH, . N(CH3) . CO . 0(CH3) ; m.p. : 44° C. 



The compound crystallises from 

 alcohol in large colourless crystals, 

 which are frequently in clusters, 

 often exhibit rather opaque planes 

 and possess a peculiar camphor- 

 like odour. 



Rho m b ic-bipyramidal. 



a:b:c = 0,8406 : 1 : 0,3320. 



Forms observed : 

 b = |010|, strongly predominating; 

 7?i=:|ilOj, and q = \011\, both 

 well developed and yielding sharp 

 reflexes ; r = |201|, fairly lustrous. 



Different crystal-individuals ex- 

 hibit not inconsiderable differen- 

 ces in the angular values. 



Measured . 

 bnn^ (010) : (110) = * 49° 57' 

 b:q = (010) : (Oil) = * 71 38 

 r:r = (201) : (201) = 103 25 

 r : w = (201) : (110) = 61 54 



Calculated . 



103° 23' 



61 40 V3 



