355 
Angular values : Observed: Calculated: 
pb: b= (120): (010) = 27 23 PM Was) 
b= om= (O10):(110) =. 746-2 46 O's 
a:n=(100):(210)= 26 9 25 46 
n:m= (210) (110) =... 17 59 18 13% 
a: p= (100):(120) =... 62 31 62 37 
No distinct cleavage was found. 
The optical axial plane is {010}. Very strong, inclined dispersion, 
with 9 < v; on {100} one axis emerges excentrically in the field of 
the microscope. 
The specific weight of the crystals at 15° C. was: 1,230; the 
equivalent-volume is therefore: 184,55, and the topical parameters are 
calculated to: y: py: w = 6,6611 : 6,5633 : 4,4381. 
§ 9. VIL. p-Toluene-sulpho-ethylnitramide. 
This substance, which has the configuration : 
CH; 
: (CgH5) 
SONS NO») 
erystallizes from ether in big, colourless erystals, or in hexagonally- 
shaped tables. It melts at 69° C. 
Monoelinie-prismatic. 
mee — 1.017821: 1,1005; 
a= 88" 11") 
Forms Observed: c = $001}, 
strongly predominant and lustrous ; 
a = {100}, sometimes large, often 
also narrower, but always yielding 
sharp reflexes; m = {130}, well 
developed, but often with curved 
faces and somewhat dull; 7 = 
{203}, well reflecting, often absent ; 
w = {133}, extremely narrow, in Wig. 7. p-Toluene-sulpho-ethylnitramide. 
most cases absent, and only approximately measurable. The aspect 
of the crystals is either short prismatic with an elongation parallel 
to the b-axis, or thin lamellar parallel to {001}. 
