A New BAUSCH&LOMB 



School Microscope 



Special Prices Quoted to Schools 



A most practical, low- 

 pricod instrument for sec- 

 ondary and high-school use. 

 The new construction of arm 

 with hand hold and fine ad- 

 justment makes it especially 

 durable for inexperienced 

 pupils to use. 



This microscope has 

 coarse and fine adjustments, 

 2 eye pieces, f and \ objec- 

 tives, double nose piece and 

 iris diaphragm in stage. 



This microscope should 

 interest every teacher. 



It has so many new fea- 

 tures that can not be told of 

 here that you should send 

 for circular. 



BH4 Microscope 

 $3.9.50 



Bausch & Lomb Optical Co., 



Rochester, N. Y. 



New York, Boston, Washington, Chicago, 

 San Francisco, Frankforta/m Germany. 



Microscopical 

 Objects 



especially prepared 

 and classified for 

 the use of 



Teachers and 



Students in 



Botany, Entomology, 

 Zoology, Physiology 

 and Bacteriology, 



also 



special set3 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.918 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" 

 30/60 "Bird's Nests and Eggs" 

 50/60 "Butterflies and Moths" 

 40 "A half hour at the seaside" 

 16 "Bird's 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 



By Professor EDWARD THOMDIKE 



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 of 

 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 



