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permanent. Logs are hauled to them by truck or shipped by 

 rail. Were it not for the many destructive fires, the fact that 

 these mills are permanent ones might have had a powerful effect 

 in influencing the forest types. 



Before a portable mill owner sets up his mill on a lot he 

 must be sure that there are at least 200,000 feet of stock in the 

 immediate vicinity that he can cut. Moving and setting up his 

 mill to cut under that amount would hardly pay him unless the 

 stock was exceptionally good. 



When large tracts of land are cut over a change in forest 

 conditions naturally results. New species, generally hardwoods, 

 take the place of the old. These hardwoods, which grow very 

 rapidly during their earlier years, shade and choke out the 

 young reproduction of the conifers recently cut, and after a few 

 years a stand of hardwoods, often of inferior quality, occupies 

 the land formerly forested with pine or other valuable trees. 



Where the mills are permanent, as in Plymouth County, the 

 owner of a woodlot is not obliged to cut his lot clean. He can 

 take out a few trees one year, haul them to the mill, and the 

 following year cut out a few more. 



When a stand is cut gradually in this way the type under- 

 goes no serious change, since the reproduction is generally the 

 same as the original trees. 



To sum up the whole thing in a few words, permanent mills 

 foster a system of selective cutting, and have a tendency to pre- 

 serve the original species and types, while portable mills in many 

 cases, through clean cutting, bring about a decided change in both. 



Poplar makes an ideal wood for staves, and as an experi- 

 ment the State Forest Commission has set out about 40,000 

 poplar cuttings on the State reservation in Carver. 



White pine is the species most used in the manufacture of 

 box boards, but of late years pitch pine is being substituted to 

 some extent. 



Stock for barrel staves is in some cases shipped from outside 

 the State, some of it being loblolly pine from Virginia. Much 

 of the stock, however, is obtained locally, and consists of pine 

 and poplar with oak and maples for headings. Oak is used in 

 the manufacture of piling and mine props. These products are 

 used in the construction of docks, wharves, etc. 



No attention has been given to cedar in the various tables, 



