of Edinburgh, Session 1881-82. 
559 
No. Mode of Preparation. 
I. By addition of KCN | 
to Bi in excess of > 
HN0 3( * . . J 
II. By addition of KCN 
to Bi3N0 3 in ni- 
tric acid (exact 
proportions not 
noted), 
III. Do. do.+ ''i 
KCy : Bi3N0 3 = )■ 
1 : 1 , . . J 
IV. Do. do. "i 
KCy : Bi3N0 3 = 4 
3:1, . . .J 
V. Do. do. 'j 
KCy : Bi3N0 3 = 
3-5 : 1, 
VI. Same salt as No. V. ) 
dried at . . j 
VII. Do. do. 
KCy : Bi3N0 3 = 
2-5 : 1, 
VIII. Do. do. 
KCy : Bi3N0 3 = [ 
2-5:1, . .J 
IX. Addition of KCN 
(excess) to Bi. 2 0 3 
in slight excess of 
HC1, . . . 
Temp, at 
which Salt 
was Dried. 
150° 
150° 
150° 
150° { 
100 ° 
150° 
100 ° 
150° 
150° 
Percentages of 
Bismuth 
Found. 
78-53; 82-21 
79-33; 80-29 
81-04 
79-93; 79-88; 1 
78-97; 80-49. 1 
78-07; 78-09 n 
78-62; 78-86; 
water in this 
salt =1*5 per 
cent. 
79-08; 79-31 
75-07; 75-69 n 
75- 85 ; water 
in this salt 
= 2-1 per | 
cent. J 
76- 39; 76-69; 
77- 31; 77-80; 
77-83 
79-45 
Mean 
Percentage 
of Bismuth. 
80-37 
79-81 
81-04 
79 ; 82 
79-72 £ 
79-19 
77T5t 
77-20 
79-45 
Mean Per- 
centage of 
Loss on Igni- 
tion, regarded 
as Oxygen. 
19-63 
20-19 
18-96 
20-18 
20-28 
20-81 
22-85 
22-80 
20-55 
Bismuth 
Oxygen 
Mean of Means. 
= 78-86 
= 21-38 
Calculated for BL0 7 . 
78-95 
21-05 
Oxygen in excess over Bi 2 0 3 = 12-40 
Bi 2 0 3 : excess of O . ==117:16-2 
12-03 
117:16 
3. These results seemed altogether to confirm the view that the 
salt to which Boedeker had given the formula Bi 2 0 5 .2H 2 0 contained, 
* Many other preparations made by this method were analysed, but the 
results varied considerably ; the above is given only as a specimen, 
t This salt was considerably lighter in colour than the others. 
+ Calculated on the dry salt. 
