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 210 brought its quota of undescribed plants. "Almost every small package of specimens received from the Natal, or the Transvaal district," he writes, "contains not only new species, but new genera; and some of the latter are of so marked and isolated a character, as to lead us to infer in the same region the existence of unknown types that may better connect them with Genera or Orders already known." To produce system in this chaos he compiled and published his Genera of South African Plants (1838), the forerunner of the larger works which constitute his principal memorial in the domain of Phanerogamic Botany. But the uncongenial climate and the intense application were too great a strain on his health and he reached Europe in 1842, prostrated in both body and mind.

Nevertheless, the final year of his residence in Africa saw the production of the first of the series of works on seaweeds by which his name will ever be best known. His Manual of British Algae was issued by the Ray Society in 1841, its Introduction dated at Cape Town, October 1840—a modest octavo volume, characterized by the thoroughness which runs through all his work.

A period of convalescence and apathy followed his return, in which he wandered about Ireland, doing some desultory botanizing; after which he settled in his old home at Limerick, and again took up the uncongenial duties connected with the family business.

But soon a new prospect opened out. The retirement of William Allman left vacant the Chair of Botany in Dublin University. Harvey had little hesitation in applying for the post, to which, he points out to a friend, "a moderate salary and comfortable College-rooms are attached. It is an old bachelor place," he writes, "and would in many ways suit me very well. The only thing on the face of it disagreeable is the lecturing, but I don't think I should mind that much, as it is lawful to have the subjects for the class written down." Harvey's candidature was viewed favourably by the University authorities, but a difficulty arose, inasmuch as the School of Physic Act prescribed that the Professor of Botany should hold a medical