CONTENTS. 



PAGE 



Introduction v 



Catalogue of the Forest Trees of North America (exclu- 

 sive of Mexico) 1 



The Physical Properties of the Woods of the United States 141 



TABLE I. 



Specific Gravity, Percentage of Ash, Relative Approximate Fuel Value, 

 Coefficient of Elasticity, Modulus of Rupture, Resistance to 

 Pressure, and Weight per Cubic Foot of the Woods of the United 

 States 144 



TABLE II. 



The Trees of the United States arranged in the Order of the Specific 



Gravity of their Dry Woods 153 



TABLE III. 



The Principal Trees of the United States arranged in the Order of the 



Relative Approximate Fuel Value of their Dry Woods .... 158 



TABLE IV. 



The Principal Trees of the United States arranged in the Order of 

 the Elasticity of their Woods (Coefficient of Elasticity, — Kilogram, 

 Centimetre) 163 



