WEIGHT RELATIONS. 



15 



Since, in the determination of the specific gravity above given, wood of the same per cent of 

 moistnre (as is the case in the values of strength) was not always involved, and also since the test 

 pieces, owing to size and shape, can not perfectly represent the wood of the entire stem, the 

 following results of a special inquiry into the weight of the wood represents probably more 

 accurately the weight and with it the strength relations of the four species. 



/rhese data refer to the average spccitic 



WEIGHT RELATIONS. 

 ' all the wood of each tree, onl.v tl 



f approximately the same age being involved.] 



From these results, although slightly at variance, we are justified in concluding that Cuban 

 and Longleaf Pine are nearly alike in strength and weight and excel Loblolly and Shortleaf by 

 about 20 per cent. Of these latter, contrary to common belief, the Loblolly is the heavier and 

 stronger. 



The weakest material would dift'er from the average material in transverse strength by about 

 20 per cent, and in compression strength by about 30 to 35 per cent, except Cuban Tine, for which 

 the diflerence appears greater in transverse and smaller in compression strength. It must, of 

 course, not be overlooked that these figures are obtained from full-grown trees of the virgin forest, 

 that strength varies with physical conditions of the material, and that tberefore an intelligent 

 iiisi)ection of the stick is always necessary before applying the values in practice. They can only 

 represent the average conditions for a large amount of material. 



DISTKIBCTION OF WEIGHT AND STRENGTH THROUGHOUT 

 U'ciyht and strength of wood at different heiyhts in the tree. 



XoTE.— Relative values arc indicated by italic flgu 



