THE PROGRESSIVE 

 SCIENCE SERIES 



THE GLOBE says : * So many books of popular science are 

 published at the present day which are not scientific at all, that 

 it is a relief to welcome another volume of the excellent 

 Progressive Science Series issued by Mr. JOHN MURRAY. They 

 have all the moderation of statement and fulness of detail which 

 is essential. 



PROBLEMS OF LIFE AND REPRO 

 DUCTION. By MARCUS HARTOG, M.A., D.Sc., 

 Professor of Biology in the University, Cork. With Illus 

 trations. 75. 6d. net. 



EARTHQUAKES : In the Light of the New Seismo 

 logy. By CLARENCE EDWARD BUTTON, Major in the United 

 States Army. Illustrated. 65. net. 



HEREDITY. By J, ARTHUR THOMSON, Regius Pro 

 fessor of Natural History in the University of Aberdeen. 

 With numerous Illustrations. New and revised edition. 9.5-. net. 



' We all know books of science which we ought to read with pleasure, 

 but to which we turn with shrinking. Full perhaps of new facts and ideas, 

 they are so expressed as to bore consumedly. "Heredity" belongs to an 

 other category. He who runs may read, even if he be a beginner, and he 

 who reads will probably not cease to run until he has traversed the last 

 page.' Nature. 



THE INTERPRETATION OF RADIUM. 



Being the substance of six free popular experimental 

 Lectures delivered at the University of Glasgow, 1908. By 

 FREDERICK SODDY, M.A., Independent Lecturer in Physical 

 Chemistry and Radioactivity in the University of Glasgow. 

 With Illustrations. Third Edition, revised and enlarged, 

 6s. net. 



'A most admirably conceived exposition which does not seek merely to 

 attract us by turning marvels, at once outstripping our imagination and 

 humbling our conception, into cheap popular gazing-stocks, but rather 

 supports its unfailing charm by the legitimate interests pointed here into a 

 fascination that may arrest even an habitually desultory reader of science 

 at once genuinely and delightfully taught. ' Spectator. 



