"I was attracted by a number of _Oncidium altissimum_ which covered one of the rocky piles, and astonished me by their long stems and bright colour of their flowers, when my attention was more powerfully attracted by a plant, the appearance of which, although different from the pseudo-bulbous tribe, proclaimed, nevertheless, that it belonged to that interesting family, the _Orchideæ_. The specimens were numerous; and clothed almost, with their vivid green, the rugged and dark trunks of the gigantic trees, which contributed to the majestic scene around me. It was not long before I discovered one of these plants in flower. It was as singular as it was new to me;--the sepals and petals of a rich purple and velvet-like appearance; the helmet, to which form the column bore the nearest resemblance, of the same colour; the labellum striated with yellow. "In the sequel of my expeditions, I found it generally in the vicinity of cataracts, where a humid vapour is constantly suspended, and where the rays of the sun are scarcely admitted through a thick canopy of foliage. I traced the _Huntleya_ from the sixth parallel of latitude to the shady mountains of the Acaria chain near the equator; but in its fullest splendour it appeared at one of the small islands among the Christmas cataracts in the river Berbice. There is a melancholy circumstance connected with the plant, which its appearance never fails to recall to my memory. Their singular beauty at this spot induced my friend, Mr Reiss, who accompanied me as a volunteer during the unfortunate expedition up the river Berbice, to draw and paint it on the spot. He was yet occupied with this task when the last of our canoes was to descend the dangerous cataract. He arose from his occupation, desirous to descend with the Indians in the canoe, although against my wish, but he persisted. The canoe approached the fall; it upset; and, of thirteen persons who were in it at the time, he was the only one who paid the rash attempt with his life. He is now buried opposite that island, the richest vegetable productions of which it was his last occupation to imitate on paper and in colours."[220] We might linger long on these flowers of strange loveliness, but space compels us to forsake them and to turn to some other examples in the wide range of Flora's domains. How glorious a sight must be the sheeted Rhododendrons of the Himalaya peaks, on whose lofty elevations Dr Hooker found these fine plants in great prominence, "clothing the mountain-slopes with a deep-green mantle, glowing with bells of brilliant colours; of the eight or ten species growing here, [on the Zemir, in Sikkim, twelve thousand feet above the sea,] every bush was loaded with as great a profusion of blossoms as are their northern congeners in our English gardens!"[221]