52 EYE SPY 
Various other blossoms respond in their own 
particular virescent hues to the vapors of ammo- 
nia, as the reader will discover upon experiment. 
The fumes of sulphur confined beneath a glass, 
as from a few common, old-fashioned matches, will 
play all sorts of similar pranks with the colors of 
petals. A little experimenting in this direction 
will afford many surprises. 
