450 KANSAS CITY REVIEW OF SCIENCE. 
obtaining the lengths and bevels of all kinds of rafters, hips, groins, braces, 
brackets, purlins, collar beams and jack-rafters; also its application in obtaining 
the bevels and cuts for hoppers, springs, mouldings, octagons, stairs, diminished 
stiles, etc. It is illustrated by more than fifty wood cuts, of value to a practical 
workman, while the explanations and directions, being written by the editor of 
the Builder & Woodworker, are plain and clear. Every good carpenter will at 
once see that it is a valuable work in his line of business. 
SCHOOL AND INDUSTRIAL HycienE: By D. F. Lincoln, M. D., Philadelphia. 
Presley Blakiston, 1880, pp. 152, 12 mo., 50C. 
This is the twelfth of the American Health Primers, which have proved so 
popular and useful during the past year, and it will be found no less valuable to 
families and teachers than its predecessors. The author, Dr. Lincoln of Boston, 
occupies the prominent position of chairman of the Department of Health in 
the American Social Science Association, and writes from long experience and 
with a thorough acquaintance with his subject. The subject is treated under 
two separate heads: School Hygiene, in which such topics as food and sleep, 
bodily growth, amount of study, exercise, care of the eyes, model school room, 
etc., are fully and practically discussed: and /ndustrial Hygiene, under which head 
are treated the injurious effects of inhaling dusty and poisonous substances, 
injuries from atmospheric changes, injuries from over use of certain organs, regula- 
tion of hours of labor, duration of life in various occupations, etc. As we have 
said before, regarding other volumes in this series, the money it takes to buy each 
one is most usefully expended in any household. 
THE THEORY OF SOUND IN ITS RELATION TO Music: By Professor Pietro Bla- 
-serna, New York: J. Fitzgerald & Co., 1880, pp. 28, 4 to., 15c. 
This is number ten of the Humboldt Library, which still maintains its high 
standing as a popular science serial. The object of Professor Blaserna, who is 
one of the Faculty of the Royal University of Rome, is stated to be to expound 
briefly the fundamental principles of the relation of sound to music, and to point 
out its most important applications. This is an object worthy of the considera_ 
tion of the lovers of science as well as the lovers of art, and doubtless both 
classes will profit by a study of the work. It is abundantly illustrated, and is 
written in a style both lucid and attractive. 
THE NATURALIST ON THE RivER AMAZONS: By Henry Walter Bates, F. L. S., 
New York: J. Fitzgerald & Co., 1880, 2 vols. quarto, pp. 80, 30C¢. 
Two numbers of the Humboldt Library complete this whole narrative of an 
eleven years’ residence and travel in South America, which, in the usual shape, 
would fill a good sized volume and cost $2.00. Here we have a lengthy and 
entertaining account of adventures, habits of insects, animals, sketches of 
