24 JULY 1915, Page 22

The literature of flies in rapidly increasing, and we have

before us two more books on the subject. Typical Flies, by Mr. E. K. Pearce (Cambridge University Press, 5s. net), is described as "a photographic atlas of diptera, including aphaniptera." The large number of excellent photographs contained in it makes the book a most valuable one fen entomologists.---The other book is a popular treatise upon The House Fly : a Slayer of Men, by Mr. F. W. Fitzsimons, the Director of the Port Elizabeth Museum (Longmans and Co., ls. net). It is especially designed for school teachers and others concerned in propaganda against flies.