TIMBER PHYSICS VARIATION IN STRENGTH. 



Strength of (%* blocks of Hit same icantliny, select material, in compression endwise. 

 [UimiMisiuiis j.fii.-r:illy, 2.76 by 2.76 by 2.76 inches.] 



371 



O Dried to about 2 per cent moisture before testing. 



As was indicated at the outset and is fully explained in Bulletins <> and 8, the plan of this 

 investigation also included among the objects to be sought the establishment of the following: 



(1) The relative value of each species. 



(2) The outward signs or physical and structural properties, easily used in inspection. 



(3) The relation of the properties among themselves; and 



(4) Their relation to the conditions under which the wood is formed, such, for instance, as the 

 age of the tree when wood is laid on. influences of soil, climate, etc. 



As has been explained, some of these relations were more or less fully determined, at least, 

 qualitatively; nevertheless, the relation of the several forms of resistance, as well as the mutual 

 relations of the properties in general, seemed to escape observation in the manner of inquiry 

 generally pursued. It became clear befo-e long that these laws must be established by special 

 series, planned each to seek answer to some specific question Several of these were carried out, 



