2 55 
Dischidia rafflesiana ( Wall .). 
The pitchers, in common with the ordinary leaves, possess 
numerous glandular bodies, but these are without exception 
transitory, and belong only to the developing organ, ceasing 
to be functional long before the pitcher is mature. To guard 
against the possibility of any misconception as to the signifi- 
cance of these glands, we have thought it well to describe and 
figure all the forms in detail. 
The Glandular Organs. 
The secretory organs of Dischidia rafflesiana are of two 
kinds — hairs and emergences. The former may very soon be 
disposed of. Hemispherical, unicellular glandular hairs, 
secreting mucilage beneath the cuticle, are frequent on both 
surfaces of pitchers and leaves alike ; they disappear very 
early, and in fact only a few were left even on a pitcher J in. 
in length, while on that f in. long it was very rare to find one 
which had not collapsed. Woolly protective hairs are also 
present on the outside of the young foliar organs. 
The secretory emergences occur in three different positions; 
we find petiolar , laminar , and apical glands. The two former, 
but not the latter, have been described by Treub and earlier 
writers. 
The petiolar glands occur at the base of the petiole of all 
three kinds of foliar organs, scale-leaves, foliage-leaves, and 
pitchers. The glands are two in number, seated one on each 
side of the petiole, at its base, so that, as Treub says, they 
seem to arise half from the petiole and half from the stem. 
The form of the gland is usually conical ; its structure is 
extremely simple. The gland consists of a uniform thin- 
walled parenchyma, which is covered by a layer of columnar 
epithelium, the cells of which are rich in protoplasm and have 
each a fairly large nucleus. The secretion, both of these 
glands and of those in other positions, is mucilage, with a trace 
of resin. All the organs of the bud are imbedded in this 
mucilage. No trace of vascular tissue was ever found in 
a petiolar gland. The structure of these glands is shown in 
Fi gs. 4, 5, 6, and 7. 
