228 DROSERA BINATA. [Cuap. XII, 
ammonia to 437 of water had all the glands blackened and all the 
tentacles inflected in 5m. A bit of raw meat, placed on several glands 
in the medial furrow, was well clasped in 2 hrs. 10 m. by the marginal 
tentacles on both sides. Bits of roast meat and small flies did not act 
quite so quickly; and albumen and fibrin still less quickly. One of 
the bits of meat excited so much secretion (which is always acid) that 
it flowed some way down the medial furrow, causing the inflection of 
the tentacles on both sides as far as it extended. Particles of glass 
placed on the glands in the medial furrow did not stimulate them 
sufficiently for any motor impulse to be sent to the outer tentacles, 
In no case was the blade of the leaf, even the attenuated apex, at all 
inflected. 
On both the upper and lower surface of the blade there are numerous 
minute, almost sessile glands, consisting of four, eight, or twelve cells, 
On the lower surface they are pale purple, on the upper, greenish, 
Nearly similar organs occur on the foot-stalks, but they are smaller and 
often in a shrivelled condition. The minute glands on the blade can 
absorb rapidly: thus, a piece of leaf was immersed in a solution of one 
part of carbonate of ammonia to 218 of water (2 gr. to 1 oz.), and in 
5 m. they were all so much darkened as to be almost black, with their 
contents aggregated. They do not, as far as I could observe, secrete 
spontaneously ; but in between 2 and 3 hrs. after a leaf had been 
rubbed with a bit of raw meat moistened with saliva, they seemed 
to be secreting freely ; and this conclusion was afterwards supported by 
other appearances. ‘They are, therefore, homologous with the sessile 
glands hereafter to be described on the leaves of Dionaa and Droso- 
phyllum. In this latter genus they are associated, as in the present 
case, with glands which secrete spontaneously, that is, without being 
excited. 
Drosera binata presents another and more remarkable peculiarity, 
namely, the presence of a few tentacles on the backs of the leaves, near 
their margins. ‘These are perfect in structure; spiral vessels run up 
their pedicels; their glands are surrounded by drops of viscid secretion, 
and they have the power of absorbing. This latter fact was shown by 
the glands immediately becoming black, and the protoplasm aggregate, 
when a leaf was placed in a little solution of one part of carbonate 
of ammonia to 437 of water. These dorsal tentacles are short, not being 
nearly so long as the marginal ones on the upper surface; some of them 
are so short as almost to graduate into the minute sessile glands. Their 
presence, number, aud size, vary on different leaves, and they are 
arranged rather irregularly. On the back of one leaf I counted as. 
many as twenty-one along one side. 
These dorsal tentacles differ in one important respect from those on 
the upper surface, namely, in not possessing any power of movement, 
in whatever manner they may be stimulated. Thus, portions of four 
leaves were placed at different times in solutions of carbonate of 
ammonia (one part to 437 or 218 of water), and all the tentacles on the 
upper surface soon became closely inflected; but the dorsal ones did 
