314 Chittenden and W hitehouse—Metallic 
These results plainly indicate that more than one compound of 
lead is formed, especially so with basic lead acetate, the composition 
being dependent in this case on the amount of lead salt added. With 
neutral lead acetate, the variations in composition are not so marked 
and as it is hardly possible to prepare a lead albuminate free from 
salts, or to eliminate them wholly in the calculations, it is question- 
able how far the results should be trusted, except in a general way. 
The formula (C,,H,,,N,.SO,,),+Pb—H, would require 3°10 per 
cent. Pb, while (C,,H,,,N,SO,,),+Pb—H, would require 2°50 per 
cent. Pb. In the case of the albuminate formed with basic lead 
acetate, it is to be noticed that the compound made by the addition 
of a large excess of the lead salt, contains about five times as much 
lead as the ordinary basic lead compounds. 
(c) Lron Compounds. 
F. Rose* has made iron albuminate, both from egg-albumin and 
from the serum of ox-blood, by the simple addition of ferric chloride 
to the albumin solution. Two preparations made from egg-albumin 
yielded respectively 2°79 and 2°88 per cent. of ferric oxide. Rose 
found the albuminate, when freshly precipitated, easily soluble both 
in excess of ferric chloride and in excess of the albumin solution. 
Our preparations were made wholly from dialyzed albumin, and 
when so prepared and thoroughly washed the compound was found 
almost wholly free from adhering salts, so much so that after a 
few trials we deemed it unnecessary to make the determinations 
of iron other than by simple ignition and weighing as ferric 
oxide. . 
Following are some of our results: 
Series I. 
With Fe,Cl,. 
No. Amt. sub. taken. Wt. Fe.Os3. Per cent. Fe.O;. Per cent. Fe. 
la 0°7033 gram. 0 0094 gram. 1°33 : 0:92 
b 06430 0-0086 1:33 0°93 
Seriss II. 
1a 04683 0-0052 111 0°76 
b 0-3854 0-0042 1-08 0-75 
* Poggendorff’s Annalen, xxviii, p. 140, 1833. 
