PREFACE. 
I NASMUCH as these experiments were in progress for a period of 
from two to three years during which time various officers had 
much to do with them, it is difficult to mention by name those to whom 
credit and acknowledgment are especially due. Only through the co- 
operation of the Divisional Forest Officers and the detailed supervision 
of the work by the Eange Officers could the experiments have been 
cai’ried out, and the writer is pleased to acknowledge his indebtedness 
tc them and to extend his thanks. 
Obviously the real credit for the success of these experiments 
belongs to Mr. E. S. Pearson, Forest Economist, who not only initiated 
the work and carried on the bulk of the correspondence involved but 
also advised the writer in the working up of the results. ^ 
In particular, I wish to than,k the following officers who carried 
out final inspections on my behalf: — 
Messrs. J. W. Nicholson and E. G. A. Hannah of Bihar and 
Orissa ; Eai Sahib Mian Budhi Singh of Punjab ; Messrs. 
E. A. Greswell and E. Parnell of North-West Erontier Pro- 
vinces; Mr. M. A. T. Marchant of Bengal and Mr. H. C. B. 
Jollye of the Eorest Eesearch Institute, Dehra Dun. 
