January, 1906.] THE ORCHID REVIEW. 23 
O. Hallii, O. luteo-purpureum and others of like vigorous habit, is when 
the new growth is about two inches high. Any plant potted in the autumn 
that has shown unexpected vigour, and seems in want of a larger pot, can 
be carefully knocked out, keeping the roots uninjured and the ball intact, 
and placed in a larger pot, working the new compost round carefully, so 
that the plant need receive no check. A good potting compost for 
Odontoglossums is one composed of fibrous lumpy peat and sphagnum 
moss in about equal parts, with a tenth of the bulk of oak leaves added, 
together with a good sprinkling of sand, using fern rhizomes for drainage ; 
pot fairly firm, and finish off with a half inch surfacing of sphagnum moss. 
Freshly potted plants should be placed together so that they may have 
special care with regard to watering. 
ODONTOGLOSSUM SEEDLINGS.—Towards the end of the month I intend 
going through these, and potting most of those that are approximately one 
and two years old. The most forward of those that were raised last spring 
and summer will now be put into two-inch pots, this being their first shift 
into single pots. A two-inch pot may seem rather large for such tiny 
plants, as some of them will be, but this is the smallest pot we now use for 
any seedling. Pots smaller than this require plunging into other pots or 
pans, and this, in my opinion, is not to be recommended, and a little 
seedling gains nothing by being starved or cramped up for room. 
Seedlings which were raised in the spring and summer before, and which 
will now be about twenty months old, should be large enough to require 
three-inch size. A good many of the seedling Odontoglossums raised at 
Chessington during the early part of 1904 were put into three-inch pots 
last August, but the majority of them are still in the two-inch size. It is 
these that will be potted on towards the end of the month. Seedlings 
which are three years or more old should receive treatment identical with 
the established imported plants, but the smaller seedlings delight in a night 
temperature of 60°, dropping a degree or two in the morning, with a crisp 
moist atmosphere. I have found that Odontoglossum seedlings will not 
stand any coddling by having sheets of glass put over the pots on to which 
they have been pricked off, or by being put into glass covers, so often 
recommended. 
Compost.—A good compost for these little plants, of the size referred to, 
is one composed of chopped up sphagnum moss six parts, clean fibrous 
peat three parts, and one part moderately fresh oak leaves which have been 
clipped up or rubbed through a half-inch sieve. A good sprinkling of 
silver sand should be added to this, and the whole well moistened and 
thoroughly mixed. The pots should be about one third filled with small 
clean crocks, and a little of the compost spread over them. The roots of 
the little plants should then be carefully spread over this, and the compost 
