THE WOODS OF THE UNITED STATES. 



TABLE OF AVERAGES Continued. 



25& 



391 



391 



392 

 393 

 394 

 395 

 396 



Specie 



TBuga FattoniaDft 



Feeadot snga Douglasii 



Pseudotsnga Donglasii, var. ma- 

 crocarpa. 



Abiea FraBeri , 



AbicB balsamea 



Abies subalpina 



Abiea grandis 



Abies concolor 



42 3 



MS 



44.35 

 51.63 

 45.59 



35.46 

 3&02 

 34.61 

 35.08 

 36.07 



"3 S 

 "Sfeg 



775 

 1283 

 1050 



972 

 819 

 762 

 958 

 909 





m 



307 

 376 

 361 



273 

 220 

 202 

 211 

 300 



2J> 



<c S a 



. a 

 .S a 



>B o 



= &: 



ill 



6,074 1,664 

 1,608 



7,405 



6,557 

 5,851 

 4,829 

 6,255 

 6,237 



1,642 



1,048 

 1,202 

 1,015 

 810 

 1,248 



405 



Species. 



Abies amabilis 



Abies nobilis 



Abies magsiiica 



Larix Americana 



Larix occidentalis 



PALMACE.a!, 

 WasbingtODia fllifeia... 



c 



11 



42.18 

 45.46 

 46.87 

 62.16 

 74.00 



60.75 



i 



I 



.2-^ S 



g.-aa 



1260 

 1277 



1261 

 1658 



663 



g_4 

 ?3 



a a 

 I* 



338 



384 

 524 



183 



II 



7,480 

 7,256 

 6,963 

 8,763 

 11,023 



3,633 



2-9 

 lag 



g5S 



1,02 

 1,917 

 1,545 

 1,075 

 2,395 



2,550 



The following table illustrates the relation between the specific gravity and the transverse strength of the 

 wood of species upon which a suflBcient number of tests has been made to render such a comparison valuable. The 

 determinations of the specific gravity and transverse strength were, in every case, made upon the same specimen, 

 at the same time. The table is arranged according to the specific gravity of the specimens. 



It will be noticed that the strength of the different specimens closely but not invariably follows their specific 

 gravity. An examination of Table III will show, however, that in nearlj' every case where any wide difference 

 occurs it is due to imperfections in the stick disproportionately affecting its strength. Moreover, in the case ol 

 species where the specific gravity and strength of different specimens are nearly identical, their order of arrangement 

 becomes largely accidental. A slight difference in the time occupied in the strength tests, or slight variations in 

 the direction of the grain of the wood, may considerably affect the sequence in such a table : 



TABLE ILLUSTRATING THE RELATION BETWEEN TRANSVERSE STRENGTH AND SPECIFIC GRAVITY IN THE WOOD 



OF CERTAIN SPECIES. 



