326 Chittenden and Whitehouse—Metallic 
The molecular weight of CuO and SO, being the same, it is evident 
that the two are present in just the proportion to form cupric sul- 
phate. 
b. Iron compounds. 
By adding a solution of ferric chloride to an ammonium chloride 
solution of myosin, a semi-gelatinous precipitate is formed of a red- 
dish yellow color, and consisting of a combination of myosin and 
oxide of iron. The compound when thoroughly washed contains no 
chlorine. When freshly precipitated, it is partially soluble in 
dilute ammonium hydroxide, as also in sodium hydroxide, the residue 
becoming gummy or gelatinous and brownish yellow in color. It 
swells up in sodium carbonate, but is insoluble. In nitric acid the 
compound turns yellow, but is wholly insoluble and does not swell 
up. In hydrochloric and also in sulphuric acid the compound is like- 
wise insoluble. In acetic acid, however, it is soluble completely, 
forming a semi-gelatinous fluid. In this, as in other metallic com- 
pounds of myosin, acids simply dissolve out the metal and then 
exert their usual action on the myosin. The various preparations, 
washed free from iron and chlorine, and dried at 110° C. were 
analyzed with the following results: 
Series I. 
No. Amt. Sub. taken. Wt. Fe.Os. Per cent. Fe.03. Per cent. Fe. 
la 0°7046 gram. 0.0194 gram. 2°76 , tee 
a 0°7021 _0°0193 2°74 1:92 
2a 0:3762 0:0128 3°40 2°38 
b 0°3623 0:0121 3°33 2°33 
3a 0°5837 0:0141 2°42 1:69 
b 0:5618 0:0137 2°43 1-70 
4a 0:5438 0:0177 3°25 2°26 
b 0:6088 0:0197 3°24 2°26 
5a 0:4761 0:0140 2°95 2°06 
b 0:3381 0:0100 2°95 2°07 
6a 0°5101 0:0178 3°40 2°37 
b 0:5927 0:0194 3°28 2°29 
Serizs II. 
1 0°4847 0:0188 3°87 2°70 
2 073200 0°0115 3°59 2°51 
0°4118 0:01538 3°72 2°59 
4 0.5205 0°0184 3°53 2°45 
