Of the tens of thousands who are acquainted with the philosophical writings of Mr. Mill, there are probably few beyond the circle of his personal friends who are aware that he was also an author in a modest way on botanical subjects, and a keen searcher after wild plants. His short communications on botany were chiefly if not entirely published in a monthly magazine called "The Phytologist," edited, from its commencement in 1841, by the late George Luxford, till his death, in 1854, and afterwards conducted by Mr. A. Irvine of Chelsea, an intimate friend of Mr. Mill's, till its discontinuance in 1863. In the early numbers of this periodical especially will be found frequent notes and short papers on the facts of plant distribution brought to light by Mr. Mill during his botanical rambles. His excursions were chiefly in the county of Surrey, and especially in the neighborhood of Guildford and the beautiful vale of the Sittingbourne, where he had the satisfaction of being the first to notice several plants of interest, as _Polygonum dumetorum_, _Isatis tinctoria_, and _Impatiens fulva_, an American species of balsam, affording a very remarkable example of complete naturalization in the Wey and other streams connected with the lower course of the Thames. Mr. Mill says he first observed this interloper in 1822 at Albury, a date which probably marks about the commencement of his botanical investigations, if not that of the first notice of the plant in this country. Mr. Mill's copious MS lists of observations in Surrey were subsequently forwarded to the late Mr. Salmon of Godalming, and have been since published with the large collection of facts made by that botanist in the "Flora of Surrey," printed under the auspices of the Holmesdale (Reigate) Natural History Club. Mr. Mill also contributed to the same scientific magazine some short notes on Hampshire botany, and is believed to have helped in the compilation of Mr. G.G. Mill's "Catalogue of the Plants of Great Marlow, Bucks." The mere recording of isolated facts of this kind of course affords no scope for any style in composition. It may, however, be thought worth while to reproduce here the concluding paragraph of a short article on "Spring Flowers in the South of Europe," as a sample of Mr. Mill's popular manner, as well as for its own sake as a fine description of a matchless scene. He is describing the little mountain range of Albano, beloved of painters, and, after comparing its vernal flora with that in England, goes on:--