Part I. opens with a brief discussion of insects and diseases. Exercises follow, among others, on the mouth parts of insects; the internal structure of insects; biting lice; sucking lice; bed bugs; mosquitos; buffalo gnats; horse flies; house flies; fleas; ticks; mites; venomous spiders; ameba; trypanosomes; malarial parasites.

Part II. includes exercises on the round worms, hookworms. lungworms, trichina, filariae; leeches; liver fluke and other trematodes, cestodes.

Part III. provides for the study of the life history of the common house fly, the mosquito, and the flea, and gives suggestions of general procedure in the investigation.

There are useful exercises on parasiticides and anthelmintics, and their value.

In most groups both morphological and systematic studies are outlined.

The book could have been made more valuable for the general zoologist without a great increase in its size, by the addition of a few devices for identification at least of some of the less commonly known parasites, with suggestions for finding, preparing, and displaying them. The exercises pre-suppose ready-made preparations, except in the three life-histories in Part III. The exercises do not make as much use of the suggestive question and the research spirit on the part of the student as the reviewer feels is wise; but rather follows the method of indicating what is to be found and expecting the student to verify and identify the findings.

A Laboratory Guide to the Study of Parasitology, by W. B. Herms, The Macmillan Company, New York. 72 pages. Price 80 cents net.

PREVENTION AND CONTROL OF DISEASE

This book is designed to bring the remarkable work of research students of recent years, in respect to the prevention and control of diseases, within reach of the general public. It is felt that such an increased audience which understands something of the steps necessary to control disease will advance the work in two ways. It will make the general public more sympathetic with the investigations that are necessary to get the facts, and more willing to support the legislators and the health officials who must apply them.

In style and content the treatise is admirably adapted to the needs of those for whom it is written the intelligent general reader and the undergraduate student in college classes.

An enumeration of some of the principal chapter headings will enable the reader to appreciate its scope. Chapter I. is an introduction dealing briefly with some elementary biological matter. Succeeding chapters are Death-rate and Disease-prevention; Various Types of Disease and Hygienic Considerations; the Germ Theory of Disease and other Theories; The Life of Micro-organisms; Plant and Animal Parasites; Micro-organisms in Air, Water, and Food; Infection and the Spread of Disease; Disinfection and Disinfectants; Susceptibility and Resistance; Immunity; Specifics in the Treatment of Disease; Colds and Their Like; Filth Diseases, Typical and Special; Smallpox and Vaccination; Wound Infections; Diphtheria and Pneumonia; Contagious Diseases of Childhood; Tuberculosis, Its Manifestations and Causes, Its Prevention and Control, Its Cure; Yellow-fever and Malaria; Cancers; Diseases of the Second Half of Life.

The general order of discussion in each group of diseases is: (1) The general nature of the disease; (2) the history and geographical distribution; (3) cause and manner of infection; (4) prevention and control.

In our recent agitation against tuberculosis and typhoid we have been inclined to forget that there are scores of other less common or less fatal diseases, that are largely preventable, which diminish human efficiency very greatly. Without removing any of the necessary emphasis on these more important diseases this book will give the general reader a less hysterical or unbalanced attitude toward the whole question of preventable diseases.

The matter of the volume is presented in clear attractive style which will make it welcome for the purposes for which it was written.

Prevention and Control of Disease, by Frances Ramaley and Clay E. Giffin. 386 pages. For sale by the University Store, Boulder, Colorado. Price $3.00. Special rates where employed as a text book.