280 Chittenden and Blake—Distribution of 
many times, 30 to 40 hours with our slow current. A more rapid 
current, would, to be sure, bring about a change in reaction much 
more quickly, but occasionally under such conditions the antimony 
would be less closely adherent and loss occur. Then again as the 
sulphur present was gradually changed into sulphuric acid, the final, 
strongly acid-reacting fluid, became a good conductor and so at the 
last, even with our four cells, electrolytic action was quite strong. 
In washing the deposited antimony, the acid fluid was syphoned out 
and water continuously added, without breaking the current, until 
the original fluid was entirely removed. 
Following are a few of the results obtained, the antimony being 
added to 100 grams of tissue in each case. 
Standard Sb Theoretical Am’t Sb Duration 
Solution. Am’t Sb. found. of electrolysis. 
10 c.c¢. 0:0075 gram. 0-0075 gram. 24 hours. 
10 00075 0-0072 48 
10 0-0075 0:0069 36 
10 0:0075 0:0074 24 
10 0:0075 0-0064 20 
5 0-0037 00028 18 
The results are certainly not all as close as those obtained in the 
absence of organic matter, but are perhaps as satisfactory as could be 
expected under the conditions of the experiment, viz: a large pro- 
portional amount of tissue (100 grams), a very small amount of 
metal and a large volume (say 500 c.c.) of fluid to precipitate from, 
with hydrogen sulphide. Even under the most unfavorable condi- 
tions, at least 75-80 per cent. of the antimony introduced into the or- 
ganic matter was recovered. 
We next turned our attention to the obtaining of some convenient 
and quick method for the direct determination of antimony in urine, 
or other like organic fluid. Preliminary experiments showed us that 
antimony, in the form of tartar emetic, could be separated completely 
from a tartaric acid solution by electrolysis. The separation takes 
place rapidly, but care must be taken to remove all of the tartaric 
acid solution by displacement with water, before breaking the cur- 
rent, otherwise the deposited antimony will instantly dissolve. Trial 
tests repeatedly gave results in close accord with theory. Excess of 
sodium tartrate, however, appeared to interfere somewhat with sep- 
aration of the antimony; while the presence of sodium chloride in 
the presence of an excess of tartaric acid, prevented entirely the 
separation of the antimony. From a sulphuric acid solution, how- 
ever, antimony was also deposited quantitatively, and on applying 
