x AUTHOR'S PREFACE 



Dr. J. Gordon Parker, who, through his researches, lectures, 

 and teaching work, has done more than any other man to 

 disseminate a knowledge of practical methods of tanning. 



The author's thanks are also due to his brother, Mr. W. 

 Gordon Bennett, M.Sc., A.I.C., M.C., for assistance in proof 

 revision, and to his father, Rev. John Bennett, for some 

 literary criticism. 



H. GARNER BENNETT. 



BEVERLEY, 



June, 1921. 



