F. W. Clarke—LIodates of Cobalt and Nickel. 281 
21°. Rammelsberg’s salt gave 50275 at 17°, and 4:9885 at 19°. 
These determinations were made by weighing in benzol with 
an ordinary specific gravity flask. 
The iodate of nickel was prepared in a manner precisely cor- 
responding to that which yielded the cobalt compound, and 
separated out in small green crystals resembling in color the 
nitrate. These also proved to be hexhydrated, and contained, 
according to Mr. Fullerton’s analysis, 11°15 per cent of nickel. 
Theory, 11-41. Specific gravity, 8°6954 at 22°. Want of time 
water of crystallization, and that they are essentially different 
from the salts obtained by Rammeisberg. 
V. Some Specific Gravity Determinations. 
as a rule those of which the density is unknown, and thus 
he realizes that his work is actually adding something to the data 
of science. In short, every student is absolutely required to 
determine some new fact for himself, and to determine it accu- 
rately. The work is done under my own personal supervision, 
and a sufficient number of checks are put upon it to render it 
reliable. The weighings, with a few exceptions, have been 
made in benzol, as in the case of the iodates already described. 
In three instances only were the weighings made in water. 
The figures, however, all refer to water as unity, taken at its 
temperature of maximum density. 
. H. B. Fullerton, as I have already stated, was 
assigned the iodates. In addition to the figures for the cobalt 
and nickel salts, he obtained the following data. 
