Am.  Jour.  Pharm. ) 
August,  1896.  J 
Bismuth  Subnitrate. 
423 
ioo°  C.  for  8  hours.  The  temperature  was  now  raised  to  1 20°  C, 
and  the  total  loss  taken  at  intervals  of  4,  14  and  34  hours,  and 
finally  drying  was  continued  at  1400  C.  for  16  hours.  The  results 
were  as  follows : 
Bulky. 
Crystalline. 
Moderately  f  Amorphous 
heav^  \  Crystalline. 
Bulky.     I  Crystalline. 
o  3 
S  2 
X  x 
"S  3 
£  2 
-a 
X  3 
'8  2 
2~ 
3°  =c 
1-1  in ' 
1-04  riS 
0-89 
0-94 
070 
o*6 1 
Heavy. 
Amorphous. 
o*35 
o-93 
o-Si 
1*04 
0-98 
026 
i'ii 
0-83 
I  "12 
I '09 
ri6 
rig 
o-8o 
I'23 
0-  98 
1-  03 
1 '23 
0-94 
rig 
I"20 
I"20 
I  "31 
0*84 
1-26 
0-98 
ro8 
i'33 
0-  97 
1-  23 
1-24 
I'2I 
r3i 
0-84 
V 
V 
<U 
v 
u 
3x 
X  u 
3  x' 
u 
3  X 
X  3 
:.  of  Moistui 
C,  16  hours. 
0  § 
<- 
0  r 
■  O 
X  3 
O  r 
j'J 
0  2 
0  r 
.a 
fk 
U  M 
30 
u  - 
i°8 
U  H 
U  M 
Ph 
Ph 
*->  "Si 
1-83 
2-30 
3"25 
5-63 
1*21 
170 
2-23 
276 
2"43 
2-51 
3*ig 
4-23 
r88 
3-65 
4-01 
4-07 
I'i5 
r68 
2*37 
3'3g 
2*55 
2-81 
3'39 
3-63 
2-13 
277 
3-26 
3  "57 
2'73 
2-85 
3"93 
3'g3 
3'03 
3'94 
3g5 
4-04 
0-84 
ri2 
2 '05 
2'35 
In  general,  when  drying  in  a  desiccator  over  sulphuric  acid  is 
sufficiently  prolonged,  all  of  the  mechanically  retained  moisture  is 
abstracted.  The  same  holds  true  when  a  substance  is  heated  for  a 
sufficient  length  of  time  at  100°  C.  From  the  fact  that  the  amount 
of  moisture  obtained  by  these  two  procedures  agree  so  closely,  we 
might  infer,  on  the  one  hand,  that  it  represented  all  of  the  moisture 
mechanically  retained,  and  that  a  portion  of  the  loss  at  1 200  C.  is 
due  to  water  chemically  combined.  On  the  other  hand,  microscopi- 
cal examinations  show  that  the  crystals,  after  having  been  heated  at 
1200  C.  for  34  hours,  had  not  suffered  any  disintegration.  The 
small  loss  may,  however,  not  affect  the  structure  of  the  crystals. 
The  above  results  will  not  admit  of  absolute  conclusions,  conse- 
quently the  amount  of  water  lost  at  -1200  C.  is  taken  as  a  basis  of 
future  calculations  for  ready  comparisons. 
Two  sources  of  information  are  still  left  us:  (1)  the  per  cent,  of 
