illustrated in Plate III.

Next, the genus may be divided into two further classes--those requiring
a high temperature, such as _D. Phalaenopsis_, _D. superbum_, _D.
atro-violaceum_, &c.; and those which may be grown comparatively cool,
which include _D. speciosum_ (an excellent plant for a sunny
conservatory), _D. moniliforme_ from Japan, _D. aggregatum_, _D.
Jenkinsii_, and many others. All the species require a high temperature,
moist atmosphere, and an abundance of water during the growing season,
but should be kept drier and cooler after the growth is completed to
prepare them for flowering. The species with pendulous growths should be
grown in baskets or suspended pans.

~Diacrium.~--A section of Epidendrum, with hollow pseudo-bulbs, and white,
wax-like flowers. _D. bicornutum_ is a very fine species for the warm
house.

~Disa.~--A genus of terrestrial Orchids from Africa, best represented in
gardens by the fine Scarlet _Disa grandiflora_, which, with the others
of its section, _D. racemosa_ and _D. tripetaloides_, have produced many
beautiful hybrids. These are cool-house plants, and should be potted in
a mixture of peat, Sphagnum-moss, sand, and loam fibre. They are
increased by offsets, and, when repotted soon after the flowering
season, the strong growths should be potted on for flowering, and the
smaller ones placed together in store pans. Free drainage should be
provided, and the plants liberally watered until they flower. After this
stage, cultivation in a cold frame for a few weeks before repotting and
returning the plants to the cool house will benefit them.

The _D. graminifolia_ or Blue Disa section do not increase by stolons.
They are heath plants, and should be potted in sandy peat, and kept
quite dry when they lose their leaves.

~Epidendrum.~--There are over 400 known species of this genus. _E.
vitellinum_ is a fine orange-coloured, cool-house species. All may be
grown in the intermediate house. _E. O'Brienianum_, _E. radicans_, and
_E. Boundii_ are fine plants for covering the ends of houses and back
walls.

~Eria.~--An interesting genus, comprising many curious, and some very
pretty species. They are epiphytes, and should be grown in the
intermediate house. The deciduous species need to be kept dry when at
rest.

~Eriopsis.~--These are epiphytal Orchids from South America. They should
be grown in the intermediate house, and they need moisture and shade.
_E. biloba_ and _E. rutidobulbon_