26.--+The Interpretation of Radium.+ By FREDERICK SODDY, Lecturer in Physical Chemistry in the University of Glasgow. 8vo. With Diagrams. Net, $1.75. As the application of the present-day interpretation of Radium (that it is an element undergoing spontaneous disintegration) is not confined to the physical sciences, but has a wide and general bearing upon our whole outlook on Nature, Mr. Soddy has presented the subject in non-technical language, so that the ideas involved are within reach of the lay reader. No effort has been spared to get to the root of the matter and to secure accuracy, so that the book should prove serviceable to other fields of science and investigation, as well as to the general public. 27.--+Criminal Man.+ According to the Classification of CESARE LOMBROSO. Briefly Summarized by his Daughter, Gina Lombroso Ferrero. With 36 Illustrations and a Bibliography of Lombroso's Publications on the Subject. _In preparation:_ +The Invisible Spectrum.+ By Professor C. E. MENDENHALL, University of Wisconsin. +The Physiology and Hygiene of Exercise.+ By Dr. G. L. MEYLAN, Columbia University. _Other volumes to be announced later_ Footnotes: [1] For a description of the methods employed in measuring skulls see Part III. [2] For a description of the methods used in measuring the acuteness of these senses, see Part III. [3] As in the case of the Sicilian brigand Salomone (see Fig. 19). Transcriber's Notes: Passages in italics are indicated by _underscore_. Passages in bold are indicated by +bold+. Illustration captions are indicated by =caption=. Additional spacing after some of the quotes is intentional to indicate both the end of a quotation and the beginning of a new paragraph as presented in the original text. The original text includes Greek characters. These characters have been removed from this text version because the original text provides a translation. The following misprints were corrected: "possesssed" corrected to "possessed" (page xiv) "Ethnolgy" corrected to "Ethnology" (page 129) "pecuilar" corrected to "peculiar" (page 135) "associaton" corrected to "association" (page 187) "segregrated" corrected to "segregated" (page 206) "distinguising" corrected to "distinguishing" (page 228) "chlidren" corrected to "children" (page 321) "his" corrected to "has" (advertisements)