S6 4 



THE POPULAR SCIENCE MONTHLY. 



Weber, Gauss, Ampere, Volta, Ohm, Fara- 

 day, Watt, Joule, Dr. Werner von Siemens, 

 Sir William Siemens, Daniell, and Von Jacobi. 

 A sketch of Coulomb is also given, without 

 a portrait, and the author doubts if one is 

 extant. In each sketch is told how and 

 when the name of the subject was adopted 

 for an electrical unit. A chapter by Prof. 

 H. S. Carhart on Modifications of the Prac- 

 tical Electrical Units, is added, in which it 

 is pointed out that, since there are three 

 units of resistance in use, there are accord- 

 ingly three modifications of all units depend 

 ing upon this. 



Psychological investigators will be in- 

 terested in Prof. Joseph Jastrow's essay on 

 The Time-Relations of Mental Phenomena, 

 published in the series of Fact and Theory 

 Papers (Hodges, 50 cents). The paper defines 

 and analyzes simple and complex reactions, 

 describes the methods of experimentation 

 that have been devised by a number of inves- 

 tigators, and gives two tables one of simple, 

 the other of complex reaction times from 

 the observations of Cattell, Berger, Munster- 

 berg, Kries and Auerbach, Merkel, and 

 others. Various conditions affecting the 

 times of simple reactions, and such as affect 

 distinction, choice, association, and other ele- 

 ments of complex reactions, are discussed, 

 and a classified bibliography is appended. 



A little manual on Maps and Map-Draw- 

 ing, by William A. Elderton, has been is- 

 sued in Macmillan's Geographical Series 

 (Macmillan, 35 cents). It describes briefly 

 various modes of surveying, and tells some 

 of the things that can be learned from 

 globes among them the explanation of 

 great-circle sailing. In the chapter on map- 

 drawing the several projections are de- 

 scribed; contouring, hachuring, and mezzo- 

 tint shading are taken up ; and a few direc- 

 tions for the use of maps are given. A 

 short chapter on copying maps is included ; 

 but the author does not deem this as im- 

 portant as the drawing of memory maps. 

 The latter subject he, accordingly, treats 

 more fully, giving directions for drawing a 

 memory map roughly, taking France as an 

 example ; also for doing more careful work, 

 using England and Wales as the subject; 

 and for a rough map of the world on Mer- 

 cator's projection. 



An address on Tlie Future of Agricult- 

 ure in the United Stales, by Dr. Peter Collier, 

 of the New York Agricultural Experiment 

 Station, is devoted to the exhortation of 

 farmers to study and put more intelligence 

 into their work, and to the enforcement of 

 the thesis that " we have not yet begun to 

 approach the limit of even profitable pro- 

 duction upon our lands." 



A new monthly periodical, called the Edu- 

 cational Review, is to be begun in January, 

 to be published by Henry Holt & Co. Prof. 

 Nicholas Murray Butler, of Columbia Col- 

 lege, President of the New York College for 

 the Training of Teachers, will be its editor, 

 and will have as his associates head-master 

 E. H. Cook, of Rutgers Preparatory School, 

 New Brunswick, N. J. ; Dr. William H. Max- 

 well and Dr. A. B. Poland, superintendents 

 of schools in Brooklyn and in Jersey City. 

 The University, the Preparatory School, and 

 the public schools will thus be represented 

 in its editing. The enterprise starts with 

 the approval, attached to its prospectus, of 

 some hundred leading educators. 



Foet Lore, a monthly magazine, devoted 

 to Shakespeare, Browning, and the compar- 

 ative study of literature (Poet Lore Co , 

 1602 Chestnut Street, Philadelphia), Charlotte 

 Porter and Helen A. Clarke, editors, is a lit- 

 erary periodical of the highest order. Be- 

 sides the two authors specially named, re- 

 cent numbers have contained studies of the 

 Provencal poets, by Miss M. L. Elmendorf ; 

 English and German Literature in the Eight- 

 eenth Century, by Prof. Oswald Leiden- 

 sticker ; Shelley ; the Alkcstis ; Dante ; The 

 Russian Drama, by Nathan Haskel Dole; and 

 other papers, which define the scope of the 

 publication as a sufficiently broad one to 

 make it acceptable to all cultivated readers. 

 The November number contains a study of 

 Browning's " Childe Roland." Next year, 

 in lieu of the July and August numbers, 

 double numbers will be published in June 

 and September, each containing a foreign 

 work of the first order, little known, but 

 destined to awaken strong interest. The 

 contents will be increasingly in the direc- 

 tion of comparative criticism. Price, 25 

 cents a number; $2.50 a year. 



G. P. Putnam's Sons publish, in the Story 

 of the Nations Series, Switzerland, prepared 



