6 THE MYCETOZOA; of which Hooker was editor. Berkeley consented, and in three years produced a book which at once took its place as the standard work on British fungi, a position it held for 35 years. In later years, he wrote books to popularize the study of fungi, and a number of papers on the specimens sent him by many collectors at home and abroad ; but this work on British fungi was the most important volume Berkeley published. He writes that he could never have undertaken the task without the advantage of the stores Sir William Hooker had accumulated or of the help he received from his friends and correspondents. In his classification, and indeed in his definitions of genera and species, Berkeley followed the lines laid down by his corres- pondent, the eminent Swedish botanist, Elias Fries, whose classic work, written in Latin, on all the fungi then known, had appeared a few years previously. The Mycetozoa, still classed with Puffballs, are placed in a subclass to themselves called " the Myxogastres," and are defined as " at first very soft and mucilaginous." Sixty-six British species are described, grouped under 15 genera. Berkeley quotes valuable references to the works of earlier authors and gives careful notes on the characters of the specimens he had seen. In studying his book, one is im- pressed by the able manner in which he deals with what must have seemed at first an overwhelming mass of facts and material. His collections are now in the Kew Herbarium, where, accom- panying the specimens, one may read notes written in his small neat handwriting, to many of which careful pencil drawings are added. Berkeley's private life was uneventful. After leaving Margate, he became Perpetual Curate of Apethorpe, near Kingscliffe, Northamptonshire, where he lived for 35 years. He then received the living of Sibbertoft, near Market Har- borough, and remained there till his death, in 1889, at the age of 86. His means were moderate, his family large, and his health often poor, but his industry never flagged, and help and advice were readily given to the many correspondents who applied to him. Of the friends who assisted Berkeley in his scientific work, Christopher Broome should receive mention. A number of papers un fungi appear under their joint names. Broome's collections of Mycetozoa are now in the British Museum. In many cases the specimens are duplicates of those in Berkeley's herbarium