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POPULAR SCIENCE MONTHLY. 



and his portrait occupies the place of 

 honor as the frontispiece to the volume. 

 An appendix of over 200 pages contains 

 a vast amount of condensed informa- 

 tion on a variety of subjects, and bears 

 out the inference that no effort has 

 been spared to make this, like the pre- 

 ceding volumes, worthy of the large 

 expenditure involved and the wide dis- 

 tribution it is given. 



METEOROLOGY. 

 A WELL-ARRANGED, readable and gen- 

 erally satisfactory presentation of the 

 principles of meteorology may be found 

 in the latest text-book on that subject, 

 Bornstein's Leitfaden der Wetter- 

 kunde. The general plan of the book 

 is conventional, but there are one or 

 two features which deserve special men- 

 tion. In the introduction an interest- 

 ing figure shows the 'thermo-isopleths' 

 for Berlin, these lines indicating, in 

 one drawing, both the diurnal and the 

 annual march of the air temperature. 

 In the chapter on temperature all im- 

 portant matters are considered, includ- 

 ing the recent work of Pettersson and 

 Meinardus on long-range forecasts for 

 Europe based on the special character- 

 istics of the Gulf Stream, and a brief 

 summary of the meteorological results 

 of the international balloon ascents, in 

 some of which the author took part. 

 The physiological effects of atmospheric 

 humidity receive some consideration, 

 and a new table is given showing, for a 

 number of stations, the probable fall 

 of temperature below the wet-bulb read- 

 ing of an afternoon hour, to be expected 

 during the night. This table is useful 

 in predicting frost. The much-agitated 

 question of hail prevention by cannon 

 firing is briefly taken up in the sections 

 on rainfall. The chapter on weather 

 is very complete. Thunderstorm charts 

 and theories; the weather types of van 

 Bebber and Koppen, and the weather 

 services of the world, are all discussed, 

 the weather types being fully illus- 



trated. A noteworthy feature of the 

 work is the nine colored views of cloud 

 types, similar to those in the Interna- 

 tional Cloud Atlas. This is the first 

 text-book to have such elaborate illus- 

 trations of clouds. A fairly good work- 

 ing bibliography is appended, which in- 

 cludes comparatively few works in 

 English. The index is good, but the 

 chapters are not numbered, and there 

 are no section headings in the text. 



PSYCHOLOGY. 

 'An Introduction to Psychology,' by 

 Mary Whiton Calkins (The Macmillan 

 Company), is one of the text-books 

 in psychology that makes it obvious 

 that psychology is to a great ex- 

 tent all things to all men. The books 

 do not present the same body of ac- 

 cepted truth, varying only in such mat- 

 ters as arrangement and adaptation to 

 students of different capacities and dif- 

 ferent practical needs. Changing your 

 psychology book is not so much chang- 

 ing your coat as changing your skin. 

 Miss Calkins, for instance, includes the 

 study of 'the conscious relation of the 

 human self to a divine self as a sample 

 of certain mysterious relationships be- 

 tween selves apart from those due to 

 physical agencies. She includes a sym- 

 pathetic discussion of the phenomena of 

 telepathy and veridical hallucinations. 

 Many of her co-workers would rigor- 

 ously exclude both these topics. She 

 makes no mention of the instructive 

 reactions which are the fons et origo of 

 our later intellects and wills or of the 

 law of habit which would seem to many 

 to be the key to comprehension of men- 

 tal processes. Yet Miss Calkins's book 

 is as scholarly and fair an exposition 

 of the elements of psychology as any of 

 the recent books. Those who seek from 

 psychology training in analysis and dis- 

 crimination and approach the study 

 from an interest in general philosophy 

 will find it a particularly helpful 

 manual. 



