A series of beautifully executed coloured drawings and dissections, illustrating Berkeley's zoological studies, may be seen at the Herbarium, Kew. Although all Berkeley's publications up to this time dealt with zoological subjects, yet the study of Botany had been by no means neglected, and about this time having made the acquaintance of Dr Harvey of Dublin, Dr Greville of Edinburgh, the author of _Scottish Cryptogamic Flora_, and of Captain Carmichael of Appin, N.B., a trio of the most celebrated cryptogamists of the age, Berkeley forsook the serious study of zoological subjects, and devoted the whole of his leisure time to the lower forms of plant life. Living at Margate, the marine algae naturally attracted Berkeley's attention, and in 1833 he published his _Gleanings of British Algae_, consisting of a series of detailed investigations on the structure of the minute and obscure forms of marine and fresh-water species. This work, illustrated by twenty coloured plates, was originally intended to be included in the supplement to Dr Greville's _Scottish Cryptogamic Flora_, but in consequence of the discontinuance of that most excellent work, was issued as an independent booklet. From the first Berkeley was deeply interested in the fungi, and practically all his subsequent work was devoted to this group of plants, and although well versed in general Cryptogamic Botany, it was in the field of Mycology that his laurels were won. A review of the work done can be most conveniently discussed under three separate headings--Systematic Mycology, Morphology and Literature, and Plant Pathology, respectively. _Systematic Mycology._ Under the title _British Fungi_, four fascicles of dried and well-prepared specimens, numbering in all 350 species, were issued between 1836 and 1843. In those days exsiccatæ were not issued from a commercial standpoint, as is too frequently the case at the present day, but represented the outcome of careful investigation on the part of the author, hence Berkeley's exsiccatæ are at a premium at the present day. In 1828 Berkeley first corresponded with Sir W. J. Hooker on matters dealing with cryptogams, and in one of his early letters stated that he had devoted much time to the study of fungi, more especially to the extensive genus _Agaricus_, which at that period included all the gill-bearing fungi. At this time, Sir William was engaged in preparing the volumes dealing with cryptogams, as supplementary to _The English Flora_ of Sir James Edward Smith, and approached Berkeley on the subject of undertaking the section dealing with Agarics, in the volume devoted to the fungi. Berkeley agreed to this arrangement, and was finally induced to describe the whole of the fungi. A footnote at the commencement of the volume by Sir W. J. Hooker is as follows: