338 DROSOPHYLLUM LUSITANICUM. Cuar. XV. 
pedicels and to the minute sessile ones. Before a 
gland has been in any way stimulated, the exterior cells 
commonly contain only limpid purple fluid; the more 
central ones including mulberry-like masses of purple 
granular matter. A leaf was placed in a little solution 
of one part of carbonate of ammonia to 146 of water (8 
ers. to 1 oz.), and the glands were instantly darkened 
and very soon became black ; this change being due 
to the strongly marked aggregation of. their contents, 
more especially of the inner cells. Another leaf was 
placed in a solution of the same strength of nitrate of 
ammonia, and the glands were slightly darkened in 
25 m., more so in 50 m., and after 1 hr. 30 m. were ot 
so dark a red as to appear almost black. Other leaves 
were placed in a weak infusion of raw meat and in 
human saliva, and the glands were much darkened in 
25 m., and after 40 m. were so dark as almost to 
deserve to be called black. Even immersion for a 
whole day in distilled water occasionally induces some 
aggregation within the glands, so that they become of 
a darker tint. In all these cases the glands are 
affected in exactly the same manner as those of 
Drosera. Milk, however, which acts so energetically 
on Drosera, seems rather less effective on Droso- 
phyllum, for the glands were only slightly darkened 
by an immersion of 1 hr. 20 m., but became decidedly 
darker after 3 hrs. Leaves which had been left for 
7 hrs. in an infusion of raw meat or in saliva were 
placed in the solution of carbonate of ammonia, and 
the glands now became greenish; whereas, if they 
had been first placed in the carbonate, they would 
have become black. In this latter case, the ammonis 
probably combines with the acid of the secretion, 
and therefore does not act on the colouring matter ; 
but when the glands are first subjected to an organie 
