INTRODUCTION 3 
who gave their services to the investigation, and special 
mention should be made in this place of the efficient 
and accurate work of Mr. Graves, to whom was en- 
trusted the execution of plans in the making of which 
he shared, and of Mr. Griffith as his assistant. 
The field work done comprised the counting and 
measurement, on 1046 acres, of all Spruces down to a 
diameter of two inches, and of all other trees ten inches 
or more in diameter. All Spruces below 2 inches were 
counted under the head of ‘ tallies.” On twelve of 
these acres the trees other than Spruce were also 
measured and counted down to two inches. Each of 
the twelve acres was a square, while the remainder 
(1034) were taken by the chain method described later 
on. In addition, fourteen sample plots, of rather 
more than an acre in average size, were carefully sur- 
veyed at Santa Clara, and their trees counted, and all 
the Spruces over 5 inches in diameter, to the number of 
2,006, were analyzed. At Ne-Ha-Sa-Ne the number ot 
tree-analyses reached two hundred and ninety-eight. 
These materials, together with the silvicultural and 
other notes collected by Mr. Graves and myself during 
several years, have furnished the data presented in this 
book. It is believed that they represent accurately the 
average conditions of the region with which they deal. 
