9 



vidual type found. It is found in all size classes, but more than 

 50 per cent, consists of the No. 5, or smallest, class. It is often 

 found in pure stands, but generally contains some other tree in 

 mixture. Scrub oak is its most common associate. 





SIZE CLASSES. 



In the Worcester County survey but four size classes were 

 used. As an experiment it was decided in the Plymouth survey 

 to split the Xo. 4 size in two, thus forming five size classes, and 

 differentiating the small brush from saplings. Except for for- 

 estry purposes, such as determining more exactly the type of 

 land on which planting might be done without preliminary 

 brushing, the result does not warrant the distinction.. Follow- 

 ing is an explanation of the various classes: 



No. 1 forms the largest size class, and contains species whose 

 diameters breast high average 10 inches or better, and whose 

 height will average 60 to 80 feet. 



No. 2 represents trees whose average diameters run from 8 to 

 10 inches, and whose height will average about 50 to 70 feet. 



No. 3 constitutes the cordwood size, and species of this class 

 average about 5 inches in diameter and 40 to 50 feet in height. 



No. 4 embraces saplings and small cordwood, or thrash. 

 Trees falling in this diameter class average about 2 inches in 

 diameter and 30 to 40 'feet in height. 



No. 5 is formed of very young sprout or stunted growth, 

 such as scrub oak, stunted pitch pine, etc. In no case do the 

 diameters run higher than 2 inches. 



NON-FOREST TYPES. 



Tillage and Hay. Land covered by this heading is all under 

 cultivation. Included in this type is all the farming and agri- 

 cultural land, with the exception of pasture and cranberry bogs. 



Pasture. In the Worcester survey much land which could 

 not be classed exactly as No. 5 forest type, owing to the small 

 amount of wood growth on it, and yet which was not actually 

 used as grazing land, was classed as brush pasture. 



In this survey the heading "Pasture" includes only such 

 lands as are actually used as such. This accounts to a certain 





