THE ORCHID WORLD. 
63 
always be done by removing flowering plants 
to the warmer end. Where, however, there 
are several houses or divisions, a good plan is 
to place all the winter flowering Cattleya 
hybrids together in one, and keep them in a 
nice, brisk, bouyant atmosphere, making 
the temperature toiich 70° every day, 
excepting during extremely cold weather, and 
not allovvmg it to fall below 60° at night, at 
which low point it should not remain long. 
Watering must follow the temperature. 
With a low temperature Cattleyas must be 
watered sparingly, but when the temperature 
is raised the simple rule of water when dry 
will apply, and the Cattleyas will not lose 
their roots. With this higher temperature 
damping will also have to be performed with 
more frequency and thoroughness, and every 
effort made by judicious and rational manipu- 
lation of the ventilators to produce a fresh 
easy-to-be-breathed atmosphere. When the 
buds burst, the plants should be kept on the 
dry side, and the flowers will last longest if 
kept in the warm house. 
J. M. Black. 
u u 
Sir Joseph D. Hooker, who is in his ninety- 
fourth year, visited the Royal Horticultural 
Society's Flower Show on Tuesday, October 
nth, and greatly admired the fine display of 
orchids. 
i$ SI 
By the death of Dr. Melchior Treub, who 
was until recently director of the Botanic 
Gardens of Buitenzo/g and of the Agricul- 
tural Department of Java, the world has lost 
a great botanist. Born at Voorschoten, near 
Leyden, in 1851, Treub was at the age of 
twenty-nine appointed by the Dutch Govern- 
ment to the directorship of the renowned 
garden at Buitenzorg. The " Laboratorie 
des Savants Etrangers " was erected by him 
in these gardens for the use of foreign 
botanists. His many contributions to all 
branches of botanical science will ever remain 
a monument to his great capabilities. He 
died at St. Raphael, near Cannes, on 
October 3rd. — Gardeners Chronicle. 
ONCIDIUM H/EMATOCHILUM. 
For nearly fifty years this plant has been 
known to science. Originally described by 
Lindley, it has, until recently, always been 
regarded as a rare species, and although 
appearing occasionally in different collections, 
very few facts concerning it have been noted. 
In the island of Trinidad, British West 
Indies, Oncidiiim Lanccanum and 0. luridinn 
grow together, sometimes the roots of both 
being intermingled ; and it seems more than 
probable that Oncidiuni hceniatochilinn is a 
natural hybrid between these two species, for 
it bears a close resemblance to both. 
A batch of 0. Lanceanum has just flowered 
in the collection of W. Bolton, Esq., Warring- 
ton, who kindly sends us some flowers, 
together with two varieties of 0. hcema- 
tochilum which have flowered from the same 
consignment, one of which is a great 
improvement on the normal type, and is 
known as 0. hceinatochiliim Bolton's variety. 
The flowers are one and a half inches 
across, and of good shape. The sepals and 
petals are yellowish-green, evenly marked 
with reddish-brown blotches and spots. The 
lip is broad, pandurate, and yellowish, covered 
at the base and crest with deep rose-purple, 
and in the centre marked with a large rich 
blood-red blotch, bordered with smaller spots. 
^ 1^ 
Monument to Mendel. — A monument 
to Gregor Johann Mendel, who died at 
Bruenn in 1884, was unveiled at Bruenn on 
October 2nd, in the presence of the authori- 
ties and a large number of representatives of 
foreign institutions, including Professor Bate- 
son, Director of the " Innes " Horticultural 
Institution. Mendel contributed largely to 
the study of the theory of heredity ; besides 
taking a keen interest in meteorology and 
the various theories of sun-spots he was also 
greatly interested in his experiments with 
bees. Although he died in 1884, practically 
unknown to the world, it was not till igoo, 
sixteen years after his death, that his brilliant 
discoveries and patient work came to be 
known to science. 
