Cambridge Manuals Series. Cloth, Is. net; leather 2s. &d. net. "Dr Hewitt's little volume is especially comprehensive and well arranged. The book contains a bibliography and is sufficiently indexed and illustrated, making altogether, perhaps, as good a manual on the subject as could at the present state of our knowledge be produced in similar compass."-Times " Owing to the dangerous nature of the house fly and the general ignorance concerning its biology and habits, Dr Hewitt, some eight years

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... go, commenced to study the structure, development, and biology, also the relation of the house fly to the dissemination of disease. The results of his researches are now admirably given in this little volume, which should prove of great value, as it is now generally admitted, and the public are awakening to the fact that the common house fly is a dangerous little creature and a serious menace to the public health, and that steps should be immediately taken by all to keep down such a filthy and noxious pest. For this purpose full instructions will be found in this book."-Field