this species. Referring to the excellent descriptions of 
both in Veitch’s Manual (Pt. ii.), the chief difference lies 
in the number of leaves, for their flowers appear to be of 
the same dimensions, and in both to vary to white. 
The discoverers of this splendid Orchid were the brothers 
Schomburgk, who found it at the base of Roraima, when 
employed by the British Government in surveying the 
boundaries of British Guiana with Brazil and Venezuela. 
Sir Robert Schomburgk, however, assumed it to be C. 
pumila, Hook., which is a Brazilian Lelia, erroneously 
supposed to be Demararan (not C. Mossie, as stated in 
Veitch’s Manual and other works), as determined by Mr. 
Ridley from an examination of Schomburgk’s drawings 
preserved in the British Museum. It was next met with 
in the same locality by Mr. Siedel, when collecting for 
Messrs. Sanders and Co., and shortly afterwards by Mr. Im 
Thurn during his remarkable journey and ascent to the 
Supposed inaccessible summit of Roraima. 
The following is Mr. Im Thurn’s account of the habitat 
of C. Lawrenceana, and of the vegetation of Roraima, pub- 
lished in the Linnean Society’s Transactions cited above :— 
_ “It was here, too (at the base of Roraima), in the deep 
cuttings made by the river (Kookenaam), and half filled up 
with huge blocks of stone, that are now overgrown with 
large trees and shrubs, that one of the most famous of all 
Roraima plants grows—Cattleya Lawrenceana.” 
** This Cattleya is doubtless the one*collected by the 
Schomburgk brothers, and enumerated by Richard Schom- 
burgk as C. pumila; for it appears to be the only repre- 
sentative of this genus occurring on this side, at least of 
oraima, and this wags the only side visited by the — 
Schomburgks, It grows apparently not high up upon the 
mountain, but on the gnarled tree-trunks close to the — 
water, in the clefts through which the Kookenaam and _ 
some of its small tributary streams flow, at the height of — 
about three thousand seven hundred to four thousand feet 
above the sea. At tke time of our visit Mr. Siedel, an 
orchid-collector, having set the natives to work to collect 
the plant for hi 
_ tm, I have seen ten or twelve of these 
people come into camp, afternoon after afternoon, each 
laden with a basket (a good load for a man) full of these 
lovely plants, many of them in full fower. One day I 
