Physics, Experimental and Theoretical. By R. H. Jude, D.Sc., and
partly from the French of H. Gossin. (Chapman and Hall. 12s. 6d. net.)—This first volume treats of mechanics, hydrostatics, pneumatics, heat, and acoustics. Dr. Jude explains the use which he has made of Professor Gossin's work, which is a popular text- book in French colleges. The book is, of course, of a technical kind, and cannot be estimated in these columns.—We must be content, also, with recording the appearance of A Text-book of Plant Diseases, by George /lessee, F.L. S. (Duckworth and Co., 5s.), and mentioning a few of the more familiar plant ailments which it describes. Among these are grape-mildew, the potato disease, apple-tree canker, all of them, as indeed is true of the whole class of these diseases, caused by fungi of one kind or another. It is satisfactory to be told by Dr. /lessee, who is engaged at Kew, that "if preventive measures were intelli- gently, rigorously, and persistently carried out, based on know- ledge corroborated by repeated experiments, it might safely be predicted that the frequent wholesale destruction experienced at the present time would not be repeated."
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