4 Ohituar// Notice. 



Belfast. He returued to Aberdeen as Professor of Botany in 

 tlie University on the foundation of the chair in 1860. In 

 1877 he was obliged to resign his duties because of ill health, 

 but continued to reside in Aberdeen, and to occupy himself in 

 the study of Algse, when his health would permit, almost till 

 his death on July 15, 1882. In 1838 he joined the Edinburgh 

 Botanical Society (of which he was elected an Honorary 

 Fellow in 1877), in 1863 the Linnean Society, and in 1881 

 the Eoyal Society of London. He was also a member of the 

 Societe des Sciences Naturelles de Cherbourg, and of various 

 local societies. 



From an early period his tastes lay markedly in the direc- 

 tion of the study of botany, and he investigated assiduously 

 the flora of the district around Aberdeen, but seems not to 

 have published anything before 1837. From 1837 onwards 

 he published a number of articles in the Magazriu of Zoology 

 fviid Botany, the London Journal of Botany, the Annals and 

 Magazine of Natural History, the Reports and Transactions of 

 tlie Edinburgh Botanical Society, the British Association Reports, 

 and latterly in the Journal of the Linnean Society. He also 

 furnished botanical appendices to the works of certain Arctic 

 travellers and to the transit of Venus expeditions, and to 

 Macgillivray's Natural Histoi^ of Deeside. Reference to Sir 

 W. J. Hooker's British Flmm, to Harvey's Phycologia Britan- 

 nica, to Ealf's British Desmidiecc, and to Smith's British Diato- 

 rnacecc, shows that he contributed valuable information to these 

 works, not only in regard to localities, but also by the discovery 

 of various plants new to Britain, and of some new to science, 

 of which several bear his name. 



He also took a warm interest in, and contributed numerous 

 papers to, the Philosophical Society of Aberdeen, and to the 

 Natural History and Philosophical Society of Belfast. His 

 articles in magazines cover a wide range of subjects, but are 

 for the most part morphological or physiological, and several 

 deal with the modes of reproduction in plants. His first 

 article on Algae appeared in 1844, but thereafter he gave his 

 attention more to Algfe, and latterly almost restricted his 

 studies to that group, and chiefly to the marine species. The 

 results of his labours among Alg?e from various parts of the 

 world were published by him for the most part in the Journal 

 of the Linnean Society. Among other material of study the 



