L\NTERN SLIDES 

 and PROJECTION 



For Nature-Study and Science Teachers 



Our Booklet, 

 Projection for 

 Science Teachers 

 and Lecturers, in 



___^^_^^_^^_^_^^^_^_^_^_^^^^^^____^ addition to obser- 

 vations on projec- 

 tion, contains descriptive matter and lists of Fifteen Sets of 

 Educational Slides — more than 800 slides and over 

 4000 illustrations. 



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