328 Chittenden and W hitehouse— Metallic 
Series IT, 
No. Amt, Sub. taken. Wt. ZnO. Per cent. ZnO. Per cent. Zn. 
la 0°6258 gram. 0-0051 gram. 0°82 0°65 
b 0:6618 0°0054 0°81 0-65 
2a 0:53815 0:0064 1°21 0:97 
b 0°5485 0-0065 1:18 0:94 
3a 0°7925 0:0064 0°81 0°65 
b 0°6913 0:0057 0°83 0°66 
4a 0:4858 0:0062 1:27 1:02 
b 0°5318 0:0066 1°24 0:99 
da 0°6635 00056 0°85 0°68 
b 0°6504 0:0050 0:76 0-61 
6a 0:6263 0:0055 0°87 0°70 
b 0°6639 0-0059 0°88 0°71 
The average content of zinc (Zn) is 0°72 per cent. Unlike the iron 
and copper compounds, there is here less variation in the composition 
of the various preparations. 
d. Nickel and cobalt compounds. 
The extremely low percentage of zine in the zinc-myosin com- 
pounds, as contrasted with the iron in the iron compounds, led us to 
make a nickel and cobalt preparation for the sake of comparison. 
The results, in both cases, accord more nearly with those of the iron 
compound, for although containing a higher percentage of metal 
than the latter, it was necessary to prepare them both under just 
such conditions as in the iron compound led to the highest percent- 
age of iron, viz: a large excess of the precipitant. Following are 
the analytical results obtained with both substances: 
With Ni (NO,),. 
No. Amt, Sub. taken. Wt. NiO,. Per cent. NiOs. Per ceut. Ni. 
la 0°6165 gram. 0:0045 gram. 7:29 4:71 
b 0°7016 0-0051 7°26 4°70 
With CO (NO,),. 
fay)... ”” 8490 0-0064 9-95 6°45 
b 06696 0-0065 9°70 6°28 
2a 06451 00056 8°75 5°67 
b 06842 0-0060 8°84 5°72 
