volume of small trees that grew to merchantable size dur- 

 ing the period and of increasing the sample-tree diameters 

 by the measured diameter growth of the past decade. 

 The difference between the present and projected volume 

 of the sample trees was then expressed as a percentage 

 increase and applied directly to the inventory volume. 



Drain 



Data on forest industries and estimates of commodity 

 drain for the year 1937 were based upon an intensive field 

 canvass of the primary forest-products plants and domestic 

 wood consumers Since 1938 the Forest Service has co- 

 operated with the Bureau of the Census to obtain lumber- 

 production information and other wood-products statistics. 

 This cooperation consisted of editing Census forms and of 

 making a field check of new and nonreporting operators. 



Computations 



Compilation of the inventory and growth data was 

 accomplished through the use of punch cards. The 

 machine tabulations obtained from the punch cards could 

 be used directlv in the preparation of final tables. The 

 flexibility, uniformity, and economy of this method made 



possible the rapid, precise compilation of a large volume of 

 data at reasonable cost. 



Definition of Terms Used 

 Land-Use Classes 



Productive forest land. — Forest land having qualities essential for the 

 growth ot merchantable saw-timber stands. 



Nonproductive forest land. — Forest land lacking the qualities essential 

 for the growth ol merchantable saw timber. 



Cropland, old and new. — Land used for production of farm or orchard 

 crops or evidently so used during the past 5 years. 



Pasture. — Cleared or open land under fence used primarily for grazing. 



Abandoned cropland. — Land once cultivated but showing distinct 

 evidence of having been abandoned for agricultural crop production. 



Other non/orest. — Land included within the corporate limits and 

 suburban or industrial sections of cities and communities; power, rail, and 

 highway rights-of-way; marsh, and nonmeandered waterways. 



Species Groups 



Softwoods. — Loblolly, shortleaf, pond, longleaf, Virginia, Table Moun- 

 tain, pitch, and eastern white pines, eastern hemlock, red spruce, Fraser 

 fir, eastern redcedar, Atlantic white-cedar (C/iamaecvparis thvoides), and 

 baldcypress. 



Hardwoods. — Sweetgum, black, swamp, and water tupelos, vellow 

 poplar, oaks, American chestnut, hickory (Carya spp.), ash, elm, maple, 

 flowering dogwood, and associated minor species. 



Species Mentioned 



Lumber or trade name 



SOFTWOODS 



Recognized common name 



Botanical name 



Cypress. 



Hemlock . 



Cedar, red Eastern red cedar Juniperus virginiana 



Cedar, white Atlantic white-cedar ("southern white cedar") Chamaecyparis thvoides 



I Baldcypress ("southern cypress") Taxodium distichum 



[ Pondcypress T. ascendens 



Fir, eastern Fraser fir ("southern balsam fir") Abies fraseri 



I Eastern hemlock Tsuga canadensis 



Carolina hemlock T. caroliniana 



Loblolly pine Pinus taeda 



Longleaf pine P. palustris 



Pitch pine P. rigida 



Pond pine P. rigida serotina 



Shortleaf pine P. echinata 



Table Mountain pine P. pungens 



Virginia pine P. virginiana 



Pine, white Eastern white pine P. strobus 



Spruce, eastern Red spruce Picea rubra 



HARDWOODS 



Ash, mountain American mountain-ash Sorbus americana 



I White ash Fraxinus americana 



Ash, white „ .. , „ ; . . 



[Carolina ash r . caroliniana 



Basswood American basswood Tilia glabra 



Pine, southern yellow . 



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