350 
Fig. 2. p-Toluene-sulpho-methylamide. 
Rhombic-bipyramidal. 
a:6:¢=1,0358 : 1 : 2,6074. 
The crystals represent evidently pseudo-tetragonal limiting forms; 
also optically they approach to tetragonal symmetry. 
Observed Forms: c = {001}, very lustrous, predominant, giving 
splendid reflexes; = {101}, and g = {011}, almost equally broad, 
well reflecting; o = 121}, small, dull, and difficult to measure 
accurately. The aspect of the erystals is thin tabular parallel to {001}, 
often with a slight elongation in the direction of the b-axis. 
Angular values: Observed: Calculated: 
c: 7 = (001): (101) =* 68°20' == 
c:q= (001): (011) =* 69 1 = 
r:r=(101):(101)= 43 20 43°20’ 
q:q=(011):O011)= 41 58 41 58 
c:o =(001):(121)= 80 25 80 12 
0:0 = (121): (2h < 18-10 18 36 
Cleavage parallel to {001}. 
The plane of the optical axes is {100}, c being 1* bisector. The 
apparent axial angle is very small, the crystals approaching also in 
this respect to uniaxity. 
The specific gravity of the erystals at room-temperature was: 
dye = 1,340; the molecular volume is therefore: 138,06, and the 
topical parameters become: %: w: wo = 3,0442 :3,7113: 9 Ore 
§ 5. III. Nitro-p-Toluenesulpho-methyl-amide. 
This compound is derived from the first by substitution of a 
bydrogen-atom of the NH,-group by CH,. From ethylacetate the 
substance crystallizes in beautiful, pale yellow prisms, and melts at 
91° C. The crystals are generally dull and not easily measurable. 
Monoclinic-prismatie. 
a:b 2c = 0d: 1 -.0,3948- 
f= 86°404. 
