viii PREFACE 



The writer wishes to gratefully acknowledge the untiring 

 efforts of the members of the Educational Bureau of the Paint 

 Manufacturers' Association, whose early endeavors made possible 

 many of the tests described in this volume. Kind acknowledg- 

 ment is also made to members of the International Association 

 of Master House Painters and Decorators of the United States 

 and Canada, who stood always ready to aid in investigations 

 which promised to bring new light into their art and craft. 



HENRY A. GARDNER. 

 WASHINGTON, October, 1911. 



