52 



ECONOMIC "WOODS OF THE UNITED STATES 



TABLE III— Continued 



Species Sp. Gr. 



Abies magnifica. 47 



Magnolia acuminata 47 



Populus grandidentata. .dWfcf ^"^ .46 

 Chamaecyparis lawsoniana •ei.j4«^AQ 



Picea nigra 46 



Abies nobilis 46 



'Taxodium distichum 45 



jEsouIus glabra 45 



Tilia americana 45 



Castanea dentata 45 



Catalpa catalpa . .,'. it. c ii .' . : >i a„- .45 



Salix nigra 45 



Pinus flexilis 44 



Acer negundo 43 



"Picea sitchensis 43 



.(Esculus octandra 43 



iSalix discolor 43 



Tilia heterophylla 43 



-Tsuga canadensis 42 



Liriodendron tulipif era 42 



Abies amabilis 42 



■ Sequoia sempervirens 42 



'<^atalpa speciosa 42 



Pinus albioaulis 42 



Species Sp. Gr. 



Pinus coulteri . . La-< ; ■t '; t .' 41 



Pinus murrayana.". .^.'. .\. ..■•■■' ■■' .41 ■ 

 Populus heterophylla. ... ( I .'■. . '■ ^ 41 C 



phyll 



./?.u 



Juglans cinerea./jf.U'^-'.'.'. '.•.'.'.•. . ' .41 

 Tilia pubescens/*; ;v. .'/^ . ■ -7:^ •i-4>3rC 

 Picea alba. J.ri:'iU'. . .<i AiLi.(.Cuil 

 Populus tremuloides . . .^-.ui-.'i . .' .40 

 Libocedrus decurrens.'.- . ;»w.<-.^. . .40 

 Asimina triloba. . . ^jf<t-L\'.yi-J. i'v'.40 



Pinus glabra. .-.V-, •;•.':.'.•.;• .C . . ' .39' 

 Pinus monticola'. H.Ci: i.li i) ., .' . 39v 

 Pinus strobus. . ..; ;'... . ,. . ' . .,.''■ •'. ' >£■ 38 

 Abies balsamea . . ■''. v t<-.^ .-Vv ./. .^ .- . .38 

 Populus trichocarpa.,/v.t/.'J ... /. 38 < 

 Thuya plicata. /.,'. . ^.,-.'. . . . .-^UV.SS-i: 

 Pinus lambertiana, 'V.J.-'.-^'.'J .K . .37 ; 

 Abies concolor .... V .>. /a. ;'.'.'.. . , . 36'^ 

 Populus bal.sami£era...„"jj ; J . .- . / . 36/ 

 Abies grandis.-'. ! ;'.',,. .■.■. =, T-w .35 

 Picea engelmanni .(^j :J. i'.'> >♦ " ' 34/ 

 Thuya occidentalis. . w. I x-f* . I .. . 32 i 

 Sequoia washingtoniaya/&t-i>.TvC'^l 

 Leitneria floridana. uki fi-tii i'-'HSS 



References 



Roth, F. : Timber, Bui. 10, U. S. Div. Forestry, pp. 25-28. 



Sargent, C. S.: Forests of North America, Part 9, Tenth Census of the U. S., 



Washington, 1884, pp. 248-251. 

 Gayer, K. : Schlich's Manual of Forestry, Vol. V, 1908, pp. 50-65. 

 NoRDLiNGER, H. : Die Technischen Eigenschaften der Holzer, Stuttgart, 1860, 



pp. 115-227. 



' k^ 6\ Av 'jTy 



WATER CONTENT OF WOOD 



Water occurs in living sapwopd in three states, viz., (1) in 

 the protoplasmic contents of the cells, (2) in the cell walls, and (3) 

 as free water wholly or partially filling the lumina of cells, fibres, 

 and vessels that have lost their contents. In heartwood water 

 normally exists only in condition (2). In the fresh sapwood of 

 Pinus strobus, which may be taken as fairly typical, water com- 

 prises about half of the total weight and is distributed approx- 



