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NEW BOOKS. 

Constructive Text-Book of Practical Mathematics. By H. W. Marsh. 
Volume IV. Technical Trigonometry. New York : John Wiley & Sons. 
Pp. 232. $1.50. 

This book is quite different from the conventional text on the .subject 
and is designed for those who are to enter industrial work. The author 
tries to use the student's interests and no doubt those who work it through 
will know far more real trigonometry than the average student in the 
subject. Besides trigonometry he will know many things connected with 
machines and manufacturing which the average student will know nothing 
about. It is the result of several years' trial in the author's class-room. 

A School Course in Geometry. By W. J. Dobbs. London and New York : 

Longsmans, Green and Co. Pp. 427. $1.00. 

This volume is the result of many years of thought and experience by 
an author who is well fitted for the work. It includes not only elemen- 
tary geometry, but trigonometry and mensuration, and an introduction 
to coordinate geometry, including the elements and use of the calculus. 
Instead of proceeding from the congruence of triangles to establish fun- 
damental geometrical truths the author uses the notions of rotation, trans- 
lation and folding for which advantages are claimed. 

The Algebra of Logic. By Louis Couterat. Translated by L. G. Robin- 
son. Chicago : The Open Court Publishing Co. Pp. 98. $1.50. 
This is much the simplest and most concise handling of a subject treated 
much more extensively and ponderously by other representatives of sym- 
bolic logic. It is well fitted to serve as an introduction to the study of 
mathematical logic. A preface by Philip E. B. Jourdain is of an histor- 
ical nature and gives a very thorough account of the development of the 
subject and the various phases of it especially emphasized by the dif- 
ferent representatives. 

Memorabilia Mathematica or The Philomath's Quotation-Book. By Robert 
E. Moritz. New York : The Macmillan Company. Pp. 410. $3.00. 
The author of this book has done a good work in making such a large 
and interesting collection of quotations concerning mathematics. They 
should be interesting not only to teachers and others working in the sub- 
ject but to those whose interest is but indirect or remote. Anyone 
would have a keener and better appreciation of the subject after reading 
this book. It is arranged under the following heads : Definitions and 
Objects of Mathematics, Nature of Mathematics, Estimates of Mathe- 

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