( 132 ) 



Measured: Calculated: 

 m : c = (110) : (001) = 77 32V, 77^32' 



7n:q = (110) : (Oil) = 61 47 61 39 



m:oy = (110) : (121) = 26 30 26 27 



a:o)z= (100) : (121) = 47 55V, 48 



io :c = (121) : (001) =r 57 43 57 42 



0} -.q = (121) : (Oil) = 35 16 35 12 



m:q = (110) : (Oil) = 81 40 81 59 



m,:o = (110) : (121) = 34 39V, 34 37V, 



o:q = (121) : (Oil) — 46 19V, 46 22 



c:r = (001) : (Ï01) = 65 38V, 65 36 



a:r = (100) : (101) = 38 51V, 38 43 



m : r = (7Ï0) : (101) = 47 2 47 3 



r:q = (Ï01) : (Oil) = 70 59V, 71 177, 



No distinct plane of cleavability was found ; perhaps there is one 

 present parallel to m. 



The symmetric extinction on jllOj with regard to the side 

 110) : (110), etc. amounts to about 18°; on a and c it is normally 

 orientated. The average refraction is a tritle greater than that of 

 «-monobromo-naphtalene. 



The sp. gr. gravity of the crystals is 1,612, at 19^ ; the equivalent 

 volume is 186,10. 



Topical axes : / : if? : to : = 4,2360 : 7,3555 : 6,1655. 



5b. Trinitro-Methyl-Phenylcarbamic Methylester. 



^-Modification. When long kept, the crys- 

 tals of the «-modification turn a little 

 darker, somewhat more orange-yellow. The 

 symmetry and all the angles of the «-modi- 

 fication are, however, preserved. 



Sometimes, the alcohol deposits long 

 needles together with crystals ot the «- 

 modification. These needles have an orange 

 colour ; at about 105° they again turn 

 yellow and then melt just a little below 

 118°. Although it is not as yet quite clear 

 in what relation these needles stand to the 

 crystals, it is nevertheless certain, that they 

 represent a second less stable modification 

 of the compound. The meltingpoint of the 

 crystals of the «-modification obtained from 

 various solvents, or after healing in diffe- 



>TV 



tr\. 



Fis, 7. 



