which was then considered of great practical importance. He also
published in the 'Asiatic Researches,' in the 'Journal of the Asiatic
Society of Bengal,' and in the 'Transactions of the Medical and Physical
Society of Calcutta,' numerous valuable botanical papers; but the most
important of his Indian publications are contained in the 'Calcutta
Journal of Natural History,' edited jointly by Mr. MacClelland and
himself. Of these it may be sufficient at present to refer to his memoir
"On _Azolla_ and _Salvinia_," two very remarkable plants which he has
most elaborately illustrated, and in relation to which he has entered
into some very curious speculations; and his still unfinished monograph
of "The Palms of British India," which promises to be a highly important
contribution to our knowledge of a group hitherto almost a sealed book to
European Botanists.

"But the great object of his life, that for which all his other labours
were but a preparation, was the publication of a General Scientific Flora
of India, a task of immense extent, labour and importance. To the
acquisition of materials for this task, in the shape of collections,
dissections, drawings and descriptions, made under the most favourable
circumstances, he had devoted twelve years of unremitted exertion. His
own collections, (not including those formed in Cabool and the
neighbouring countries) he estimated at 2500 species from the Khasiya
Hills, 2000 from the Tenasserim provinces, 1000 from the province of
Assam, 1200 from the Himalaya range in the Mishmee country, 1700 from the
same great range in the country of Bootan, 1000 from the neighbourhood of
Calcutta, and 1200 from the Naga Hills at the extreme east of Upper
Assam, from the valley of Hookhoong, the district of Mogam, and from the
tract of the Irrawadi between Mogam and Ava. Even after making large
deductions from the sum-total of these numbers on account of the forms
common to two or more of the collections, the amount of materials thus