F. H. Storer—Schenbein’s Test for Nitrates. 185 
ard against the loss of any nitrous acid by volatilization. 
about five minutes. 
C. 0:0001 grm. N,O, gave a reaction in rather less than fif- 
teen minutes. 
D. 50 cc. of pure water acidulated with two drops of the 
dilute sulphuric acid, and boiled upon cadmium, without cm 
dition of a nitrate, gave no reaction with iodo-zine-stare 
plus acid, not even on standing over nigh 
ght. : ; 
Repetitions of these trials gave results that were identical 
a 
the end of half an hour the solution that had contained the 
Nitrate gave a rather strong coloration with the iodo-starch, 
While the pure water remained perfectly colorless. 
F. 000001 grm. N,O, in 50 c.c. water was tested as above. 
But no reaction was obtained with the iodo-starch, not even 
ted water actually destroys peroxide of hydrogen at the 
temperature of belting, 100 ed of pure water were boiled a 
cadmium and left to stand in contact with the metal over night ; 
tion until after the lapse of two hours, and then the coloration 
Was but slight. In seating this experiment, 100 ¢. ¢. of pure 
