by means of Potassa and Ferridcyanid of Potassium. 367 
pote easily soluble in acetic acid, and precipitable again by 
ing ammonia to this solution. 
The amount of oxyd of lead was determined from the = 
and second precipitation, and it varied from 67- r cents., 
probably this mode of ——— occasioned the fobthtition of 
more basic salts, wherefore, I was obliged to renounce the deter- 
mination of the atomic weight of this body. 
or the analysis, the lead salt was dried at 100° C. 
1, 0:3127 grammes substance gave 0°2855 grammes sulphate 
of lead = 0:2100223 grammes oxyd of lead = 67-16 PbO. ; 
2. 03455 grammes substance gave 03165 grammes sulphate 
of lead = 02328269 grammes oxyd of lead = 67-38 PbO. 
3. 1:0433 grammes substance furnished by the combustion 
with chromate of lead, 0:3935 grammes carbonic acid and 0:1103 
grammes water. 
4. 0-949 grammes substance furnished by the combustion 
with chromate of lead, 0°3568 grammes carbonic acid and 0-10 
grammes water. 
5. 0-683 grammes substance furnished by the combustion with 
soda-lime 0°8512 grammes platino-chlorid of ammonia = 0: eed 
grammes nitrogen 
In this case the relation of the atoms of oxyd of lead pa car- 
bon is 6 : 17, which proves clearly, that the determination of the 
lead in this salt is not decisive for establishing its atomic weight. 
If the mean amount of oxyd of lead 67:27 is subtracted, the 
following figures will express the composition of the combined 
organic body. 
L. Il. 
Carbon, : ‘ ’ 10-28 10°25 
Nitrogen, ‘ F vce: TE 7-82 
Hydrogen, 1:18 115 
Oxygen, 19-22 19°15 
From these values the following formula may be deduced, 
showing exactly the composition of the organic substance which 
has been combined with oxyd of lead: 
2 eS Rs 
The results of the comparison of yea found and calculated 
values expressed in per cents., is as follow 
Citeabesed, Found. 
nny r ste ~ 
a pe 3 
C, 36 = 31-03 31:40 31°31 
N, 28 24-13 23:39 23" 
x A 3:44 3-60 3°51 
0, 48 = 41-40 AI-11 41-29 
‘116 100 100 100 
