Acknowledgments 65 



permission to photograph historical material for lantern slides ; 

 Old Colony Trust Company, Boston, and Continental Life 

 Insurance Company, New York, for the loan of pictures for 

 historical lantern slides. Special mention should be made of 

 the gift by Mr. Julian A. Dimock of nearly 4,000 superb 

 negatives of outdoor subjects; of the gift of a reel of motion 

 picture film entitled "The Why of a Volcano," by the Educa- 

 tional Films Corporation of America; and the gift of one reel 

 and two half reelsof educational motion picture films from the 

 Bray Studios. 



