James Britten,
Dictionary of National Biography…
(1885)
“ Hooker's place as botanical lecturer at Glasgow, and in 1845 was appointed professor of botany in that university, leaving Arlary in 1846, and taking up his residence in Glasgow. In 1850 he was associated with Sir William Hooker in the sixth edition of the 'British Flora.' About this time he took up the study of Diatoms, of which he formed a large and valuable collection, publishing several memoirs on the subject. In 1868 his health, which had previously begun to fail, gave way, and the delivery of his university course had to be abandoned. ”
