353 
Fig. 5. p-Toluene-sulpho-ethylamide. 
Forms observed: r = {101} and v = {101}, large and very lustrous, 
mostly predominant, the crystals therefore being often tabular parallel 
to these planes; t= {101}, also lustrous, somewhat smaller than r 
and v; s={101}, smaller than ¢, and showing commonly a fine 
striation parallel to the edge s:v; a={100! and a’ {100}, narrow, 
but well reflecting; m= {110}, large, always showing a striation 
parallel to the edge m:r; p=}110}, n= {110}, and A = 110), 
large and highly lustrous; o = {121} and 2= {121}, very narrow 
and badly reflecting, 2 generally striated parallel to m:v; probably 
again g = {011}, very small and commonly not measurable. The 
aspect of the crystals is tabular parallel to r, or thick prismatic 
towards the c-axis. A cleavage occurs parallel to {101}. 
Angular Values: Observed: Calculated: 
ar = (100); (101) =" “58254: = 
a:s =(100):(101)=* 56 14 ee 
a: p= (00): (LO —*. amet ae 
a:m= (100): (110) =* 29 23 = 
r:p = (101): (110) =* 58 17 Px 
zr = (101). (101) = ~ 658 65°12’ 
s:v=(101):(101)\= 65 10 65 12 
s:p=(101):(110)= 70 40 70 24 
s:m=(101):(110) = 56 39 56 37 
sim (101):(110) = - 68°24 68 35!/ 
ap A20) — SRR 518 
On all faces the optical extinetion occurs obliquely with respect 
to the borders: on 7 about 46° with respect to the edge r:p; on 
p about 36°, on a about 43°, on m about 34° with respect to the 
direction of the c-axis. On r and p is the emergence of an optical 
axis observable, excentrically in the field of the microscope. 
