Bausch & Lomb 

 LANTERN -D 



Lecturers who have used or seen in use the 

 usual type of projection lantern, with its stiff 

 working adjustments, lenses out of center, slide- 

 cracking condensers and lack of illuminating 

 power will appreciate this new lantern with 

 its scientifically constructed optical system, 

 powerful and accurately operated lamp, cool- 

 ing cell to prevent cracking slides and mechani- 

 cally perfect adjustments throughout. 

 The further fact that Lantern D can be converted 

 into a combined microscope and slide projector 

 and a projector for opaque objects is more 

 evidence of its uniqueness and desirability for 

 school and laboratory work. Catalog Free. 



Bausch & Lomb Optical Co., 

 Rochester, N. Y. 



New York, Boston, Washington, Chicago, 

 San Francisco, Frankfurt a/M Germany. 



Microscopical 



tects 



Obj 



especially prepared 

 and classified for 

 the use of 



Teachers and 

 Students in 



Botany, Entomology, 

 Zoology, Physiology 

 and Bacteriology, 



also 



special sets of objects covering Cotton and 

 Woolen Fibres, Paper Making, Starches, 

 Pharmaceutical Preparations, etc. 



The quality of our preparations is un- 

 equalled, while the prices are extremely 

 low. 



We also offer over 20,000 Lantern Slides 

 covering a great number of Educational 

 Subjects. Complete catalogue free. 



WILLIAMS, BROWN & EARLE, 

 Dept. N.913 Chestnut St., Philadelphia. Pa, 



STEREOPTICON 

 NATURE STUDY SLIDES 



We are just completing fine sets of slides on 

 Nature subjects comprising amongst others, 



30 subjects on "Bird Babies n 

 30/60 "Birds' Nests and Eggs" 

 50/60 "Butterflies and Moths" 

 40 "A half hour at the seaside n 

 16 "Birds' Beaks" 



Also in preparation a set on Wild Flowers. 



Besides the above we have slides of every 

 part of the world. Illustrated Stories, Bible 

 Subjects, Educational and Comics. 



OVER 20,000 SLIDES IN STOCK 



FOR 



SALE OR RENTAL 



Slides, plain, 25c. & 35c. Colored, from 50c. each up. 

 Catalogues, 20c. Hire Lists, free. 



RILEY OPTICAL INSTRUMENT CO. 



23 East Fourteenth St., New York. 



EDUCATIONAL PSYCHOLOGY 



v 



By Professor EDWARD THORNDIKE 



In this book Professor Thorn dike applies to a num- 

 ber of social, and especially educational problems, the 

 methods of exact science. The topics are treated in 

 the light of the most recent researches and with the 

 aid of modern statistical technique. The book thus 

 provides those interested in education as a profession 

 or as a feature of American life with a sample of 

 scientific method in this special field as well as with 

 important information which has hitherto been inac- 

 cessible. The attitude of the author, who is the head 

 of the department of educational psychology in Teach- 

 ers College, Columbia University, and the author of 

 numerous original contributions to dynamic psychol- 

 ogy, is that of a candid and painstaking student 0' 

 the work that has been done in this field and upholds 

 rigorous ideals of scientific accuracy and logic. The 

 book is so written and illustrated as to be readable 

 and teachable. 



LEMCKE AND BUECHNER 



11 East 17th St., New York 



