346 GLANDULAR HAIRS, Cuar. XV 
which minute Diptera are sometimes, though not often, caught.* 
The cells of the glands contain bright pink fluid, charged with 
granules or with globular masses of pinkish pulpy matter. This 
matter must be protoplasm, for it is seen to undergo slow but 
incessant changes of form if a gland be placed in a drop of 
water and examined. Similar movements were observed after 
glands had been immersed in water for 1, 3, 5, 18, and 27 hrs. 
Even after this latter period the glands retained their bright 
pink colour; and the protoplasm within their cells did not 
appear to have become more aggregated. The continually 
changing forms of the little masses of protoplasm are not due to 
the absorption of water, as they were seen in glands kept dry. 
A flower-stem, still attached to a plant, was bent (May 29) 
so as to remain immersed for 23 hrs. 80 m. in a strong infusion 
of raw meat. The colour of the contents of the glands was 
slightly changed, being now of a duller and more purple tint 
than before. The contents also appeared more aggregated, for 
the spaces between the little masses of protoplasm were wider ; 
but this latter result did not follow in some other and similar 
experiments. The masses seemed to change their forms more 
rapidly than did those in water; so that the cells had a differ- 
ent appearance every four or five minutes. Elongated masses 
became in the course of one or two minutes spherical; and 
spherical ones drew themselves out and united with others. 
Minute masses rapidly increased in size, and three distinct 
ones were seen to unite. The movements were, in short, 
exactly like those deseribed in the case of Drosera. The cells 
of the pedicels were not aifected by the infusion; nor were they 
in the following experiment. 
Another flower-stem was placed in the same manner and for 
the same length of time in a solution of one part of nitrate of 
ammonia to 146 of water (or 3 grs. to 1 0z.), and the glands 
were discoloured in exactiy the same manner as by the infusion 
of raw meat. 
Another flower-stem was immersed, as before, in a solution of 
one part of carbonate of ammonia to 109 of water. The glands, 
after 1 hr. 30 m., were not discoloured, but after 3 hrs. 45 m. 
most of them had become dull purple, some of them blackish- 
* In the case of Saxtfraga tri- stance remnants of insects ad- 
daetylites, Mr. Druce says (‘Phar- _ ered to the leaves. So it is, as 
maceutical Journal,’ May 1875) I hear from a friend, with this 
that he examined some dozens of plant in Ireland. i 
plants, and in almost every in- 
