44 AMERICAN MUSEUM GUIDE LEAFLETS 



those ii"i shade-enduring, such as oak and hickory. The greatest difficulty 

 in the management oi a selection forest consists in not injuring young trees 

 when getting <>iu a crop. 



If a forest consists of trees of relatively even -ize and age r 1 1 • - " * S r ri j > " or 

 the "Patch" method may lie followed, in accordance with which one por- 

 tion i- 'ut clean each year. ( )t' course, it' a forest i- to ;. ield equalized annual 

 incomes, it must consist eventually of as many sections, varying in ages 

 from seedlings to the marketable size, a- it requires year- for the tree- to 

 attain marketable size. For instance, to yield annual crops of box-boards 

 cut from white pine tree- of thirty-five year-' growth, a forest must consist 

 of thirty-five sections; to gain annual crops of railway tie- produced from 

 catalpa trees fifteen years old. the plantation must have fifteen sections. 



T 



AIM OF WOOD LOT OR FOREST 



HE aim of the wood lot or forest will he determined on 1 it- condi- 

 tions a- to species and -oil ami _' on the present and probable 

 future market. 



' Wands in Proximity i<< I'ul/i Mills 



It i- fortunate if a forest of -oft wood- balsam, hemlock, spruce, Caro- 

 lina poplar, aspen, Cottonwood, willow, basswood, or tulip-tree ha- a 

 near market in the shape of a pulp mill, fn 1907 there were used in the 

 United State- for the manufacture of paper pulp. 3,962,660 cords of wood, 

 300,000 cords than in 1906. Of this amount 2,700,000 was spruce 

 wood, one-third of which came from Canada. 



Trees lor the pulp industry must he grown close together so that the 

 trunk- v ill In- clear of branches, because first-grade pulp wood, which may 

 bring a- high a- $10 per cord, i- free from knot-. Since a pulp mill uses 

 small pieces, even a- -mall a- '_' ft. by I in., much of the material taken 

 out in thinning a woodland may be -old \-> advantage. Experiments in the 

 future may prove that papei can he made from -till cheaper material than 

 wood, perhaps from annual plant- of rapid growth, corn-talk- or the stems 

 of other tall grasses. Hen-, a- in all questions of agriculture and fore-try, 

 landowner- must Study the market-. 



In the case of pulpwood, it i- especially true that conservation mean- not 



only maintaining a supply of raw material hut also operating economically 



in tin- use of tin- supply. Timber waste must he used a- pulpwood, clear 



t .in to the sawmill and slabs, tops and imperfect trunk- turned into 



pulp. Tin- economy i- forced upon us, particularly since Canada to protect 



