29 MAY 1915, Page 23

With the hot weather the fly is once more among

us, and, according to the medical authorities, is likely to be more dangerous than ever this year in its disease-spreading habits. Major Hurlstone Hardy's Book of the Fly (William Heine- mann, 2s. 6d. net) is therefore especially useful just now, for it not only describes the different species of flies and their behaviour, but shows how their numbers may be reduced, and their evil effect guarded against. An introduction is provided by Mr. E. Raiford Rose.