The Mechanical Arts Simplified. B. B. Dixon. Laird & Lee, Chicago, 111. 8 1/2x6 in ; 497 pp. Flexible leather covers, $2.50 ; cloth, $1.50.

A mechanic, be he amateur or professional, cannot collect too much in the way of usable data, formulas, etc. This book contains a large number of tables, rules, formulas, as welt as much general information of a usable nature, and will be found of value by all mechanics and electricians.

Modern Electricity. James Henry, M. E. and Karel J. Hora, M. Sc. Laird & Lee, Chicago, 111. 6 1/2x5 in: 355 pp. Full leather, $1.50; cloth, $1.00.

While there are a number of books covering much the same ground as does this one, the different ways used by authors for presenting a subject give to each an appropriate value. In this one every effort has been made to simplify the expressions, without sacrificing the clearness or accuracy, so that the apprentice and artisan will be able to gain a complete knowledge of the fundamental principles and applications of electricity. The work will be found practical and accurate.

Practical Points. John S. Farnum, M. E. Laird & Lee, Chicago, 111. 6x4 1/2 in. 192 pp. Cloth. $1.00

This is a handbook for engineers and mechanics, arranged in catechism form, giving questions aud answers on practical subjects connected with boilers, engines and their parts and fittings; railroad and train signals, etc., together with much general matter connected therewith. The purchase of this and similar books is cordially commended.

Vacation Photography. No. 62 Photo-Miniature. Tennant & Ward, New York. 25 cents. It is almost needless to say that anything published in this series is valuable to the photo-grapher. This is no exception, and contains many practical pointers for those about to go a vacationing. Money spent in preliminary study upon this subject means a greater saving in supplies, to say nothing of the better work resulting.