10 



Cedeic H. Guise, . . Dudley, Grafton, Holden, Leominster, North- 

 bridge, Paxton, Princeton, Rutland, Shrews- 

 bury, Spencer, Sterling, Sutton, West 

 •Boylston. 



Walter G. Ilbs, . . Athol, Phillipston, Royalston, Templeton. 



0. D. Ingalls, . . Winchendon. 



Heebeet J. Miles, . Ashburnham, Gardner, Harvard, Westmin- 

 ster. 



James Moeeis, . . Charlton, Hubbardston, Leicester, Petersham, 



Southbridge, Sturbridge. 



J. R. Simmons, . BoyMon, Berlin, Bolton, Clinton, Douglas, 



Fitchburg, Lancaster, Lunenburg, North- 

 borough, Southborough, TJxbridge, Web- 

 ster, Westborough. 



Lenthall Wtman, . . Blackstone, Hopedale, Mendon, Milfprd, 



Upton. 



Explanation of Data. 

 Size Classes. 



It is a diflficult matter to divide the woodland into size 

 classes and draw a hard-and-fast line between them. For 

 purposes of classification we have recognized four classes, Class 

 1 being the largest and Class 4 the smallest. In the field 

 intermediate classes were recognized, but in the final classifica- 

 tion these have been included with one of the four principal 

 classes. The illustrations are a help in recognizing these size 

 classes. 



Class 4- — This smallest class includes both seedling and 

 sprout growth from one to twelve years in age, from 1 to 20 

 feet in height, and less than 2 inches in diameter. This class 

 has no merchantable value, not even as cordwood. 



Class 3. — This class includes growth of from twelve to thirty 

 years of age, from 20 to 35 feet in height, and from 2 to 6 

 inches breast high diameter. With cordwood species such as 

 oak and maple this type has a low merchantable value as a 

 producer of small, low-grade fuel wood. There is no saw 

 timber in this type, so that saw species, such as pine and 

 chestnut, in this size class can be said to have no merchantable 

 value. 



Class 2. — This size includes trees from thirty to forty years 

 of age, from 30 to 50 feet in height, and from 6 to 12 inches in 



