SCIENCE— ADVERTISEMENTS 



CAMBRIDGE 

 INSTRUMENTS 



BOY'S RADIOMICROMETER 



An extremely sensitive instrument 

 for the measurement of radiant heat. 



The suspended system consists of a 

 single loop of silver wire having 

 at its lower extremity a sensitive 

 thermo-couple. The thermojunction 

 carries a receiving plate of blackened 

 copper foil. The radiation received 

 on this plate raises the temperature 

 of the thermo- junction and causes a 

 small current to flow in the silver 

 loop, which is consequently deflected. 



Send for list No. 100 



Also manufacturers of all types of 

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Tiageandra 



MiTRllMENrrfc?^A^filCAC/vc] 



MAN AND THE 



COSMOS 



By Joseph A. Leighton, L.L.D. 



Professor of Philosophy in the Ohio State 

 University. 

 Dr. Leighton in this important and ab- 

 sorbingly interesting work has for chief aim 

 the finding in the living universe of ahome 

 and a scope for humanistic values or ideals, 

 with chief stress laid upon the problemsof 

 mind and knowledge and oil the meaning 

 and value of human personality. $4-50 



JUDGING HUMAN 

 CHARACTER 



By H. L. HOLLINGWORTH, 

 Professor of Psychology, Barnard College, Col- 

 umbia University. 



A Study of the art of reading and judging 

 the characters of one self and of others, in 

 which this well-known psychologist surveys 

 the stage to which the modem science^ has 

 progressed. A keen and critical exposition 

 of practical psychology. $2.00 



HUGO 

 MUNSTERBERG 



His Life and Work 



By Margaret Munsteeberg 



"Vividly deUneated, alike as a man and 

 as a contributor to the science which ab- 

 sorbed the larger part of his working life. 

 Sets forth with remarkable clearness _ and 

 accuracy Miinsterberg's salient achieve- 

 ments in psychology; portrays the indi- 

 vidual characteristics which give biographies 

 charm." — The Boston Transcript. 



Illustrated, $3.50 



SENESCENCE 



The Last Half of Life 



By G. Stanley Hall, L.L.D. 

 "Rich in scholarship and personal experi- 

 ence, 'Senescence' is a comprehensive re- 

 view of the sum of human knowledge on 

 this subject, in order to show how the ignor- 

 ant and the learned, the child, the adult, 

 and the old, savage and civilized man, 

 pagans and Christians, the ancient and the 

 modern world, the representatives of the 

 various sciences and different individuals, 

 have viewed the problems of Age." — The 

 Annals of the American Academy. $5.00 



D. APPLETON AND COMPANY 



35 West 32d Street New York 



