346 
The aspect is short prismatic in the direction of the c-axis, oc- 
casionally also isometrically developed. 
Angular Values: 
a:m = (100) 
or — (110) 
m:m = (110) 
r:r.= (101) 
r:m = (101) 
o:m = (523) 
o:o = (523) 
0:0 =(523) 
No distinct cleavage was 
Observed : 
(110) =*% 60° 13e 
(101) =*- 67 51% 
( 
:(110)= 59 33 
(Ole 44 AT 
(110) = 79° 10 
: (110) =ca.50 56 
) 
: (523) =ca. 48 50 
(S= VIT 30 
observed. 
Calculated: 
50935! 
44 17 
19 1 
5] 51 
49 124, 
17530 
§ 5. There is evidently no distinct form-analogy present between the 
two isomeric chloro-tetracetyl-d-fructoses, in contradiction to what was 
formerly stated in the case of both a- and g-pentacetyl-d-fructoses. 
The substitution of a Cl-atom for hydrogen, has evidently, however, 
not a lowering of the degree of symmetry of the original substances 
as a consequence, all four acetyl-derivatives being rhombic-bispheno- 
idical. However, from the results obtained, it appears still to be 
impossible to demonstrate a more intimate analogy of the erystal- 
forms of the «- and g-derivatives of this series and that studied 
formerly. 
Laboratory for Inorganic and Physical Chemistry 
of the University of Groningen. 
