6 JOURNAL O^ FORESTRY 



with the height-age points obtained from stem analysis, were plotted 

 in a similar manner. The curves drawn to include every plotted point 

 except for a few stations, of which several were on the border line, 

 were strikingly similar to the original chestnut curves/ It was neces- 

 sary to raise the upper limiting curve and to depress the two interior 

 curves slightly, so that the intervals were no longer even, but indicated 

 a greater range of height growth rate of all species for the better sites, 

 a less range for the intermediate, and the least range for the poorer 

 sites. While the wider range in height growth in "Site I" is doubtless 

 due in some measure to the larger number of species found in the 

 coves and moist lower slopes, the absence of any apparent tendency 

 of the different species to group themselves at definite levels in the 

 curve section representing any one site indicates that it is also partly 

 due to an interior variation in site. The cove species — poplai", northern 

 hemlock, cucumber, etc. — were, of course, confined to the "Site I" and 

 the upper part of the "Site 11" sections of the curves, while chestnut 

 oal: points were most numerous in the lowest section. 



Of the stations representing the southern upland hardv/oods (oak- 

 chestnut-poplar), 82 fell unmistakably within the limits of one or 

 the other of the three "sites" designated, (i were "borderland" (the 

 points falling on both sides but close to one of the interior curves'), 

 and 8 were "problems," showing inconsistencies as between the heights 

 of "mature" and immature trees, or as between trees of different 

 species. Of the 83 definitely classified stations those falling in Site I 

 included 19 "coves," 3 "lower slopes," and 5 "slopes." In Site IT 

 were one "cove," 1 "lower slope." 8 "slope," 1 "upper slope," ] 

 "swamp," and 4 "ridge" stations, while 11 "slope," 3 "upper slope," 5 

 "ridge," and 20 "high altitude" stations were classed as Site III. 



The inconsistencies were so few, compared with the relatively large 

 number of stations which fully supported the site classification, that 

 they were not regarded as embodying any serious objection to the 

 method proposed. One or two cases are worth noting, since they 

 point to apparent limitations of this method, or at least to precautions 

 which must be taken in its use. One station, for example, contained 

 "mature" hardwoods, largely chestnut oak with a broken canopy of 

 an even height of about 4o feet, indicating "Site III," but with an 

 occasional white pine only 50 or (50 years old but 65 or 70 feet high. 



' Although the curves are supported by dominants of a large number of species, 

 they apply particularly to chestnut, poplar, oaks of the red oak group, and chest- 

 niit oak, which formed the principal basis. 



