306 Wisconsin Academy of Sciences, Arts, and Letters. 
evolved 2.5 cc hdrogen in 23 hours and 47 minutes, while from 
99.5 per cent, alcohol alone a like bar of magnesium liberated 
0.9 cc gas in 20 hours and 44 minutes. Table 1 shows that 
from distilled water there was evolved under like conditions 
only 0.1 cc in 23.5 hours. 
The results in table 1 show that during the first 23.5 hours 
all the solutions except, that of glycerine act more vigorously on 
magnesium than does water alone. Throughout the experiment 
the glycerine solution lags behind water. After 47.5 hours 
more gas has been evolved from the water than from the so¬ 
lutions of glycerine, sugar and mannite, and the same holds 
true after 53 hours. It is especially interesting t© note that 
the alcohol solution is much more vigorous in its action on mag¬ 
nesium than is pure water. The urea solution is relatively 
vigorously attacked, though as. has been stated, ammonia is also 
formed in this case. Again sodium chloride solution is much 
more vigorous in its action than sodium sulphate solution of 
equivalent strength. 
Tables 2, 3, and 4 show that magnesium' evolves hydrogen 
from solutions of magnesium salts at a fairly rapid rate. The 
solutions of the chloride of magnesium are the* mjost vigorously 
attacked in all cases. In the solutions containing 1 gram-mol. 
per liter (table 2) the sulphate solution is acted upon more 
vigorously than that of the bromide; in the solutions containing 
0.1 gram-mol. per liter (table 3) hydrogen is evolved from the 
bromide and sulphate solutions at an equal rate for about five 
hours within the limits of experimental error, while in the so¬ 
lutions containing 0.01 gram-mol. per liter (table 4) hydro¬ 
gen is again evolved more rapidly from the sulphate solution 
than fromi that of the bromide. In the solution of nitrate of 
magnesium nitrite is formed, as mentioned above, which ac¬ 
counts for the fact that but little gas appears in the case of this 
salt. Table 5 shows that the KOI solution containing 1 gram- 
mol. per liter acts fully as vigorously as MgCl 2 solution of 1 
gram-mol. per liter. The double potassium magnesium chlo¬ 
ride acts still more strongly, as the table indicates. The ob¬ 
servation that KOI solutions act readily on miagnesium agrees 
with that of Tommasi; Mouarour called the action feeble. 
