24 BULLETIN 285, U. S. DEPARTMENT OF AGRICULTURE. 



Plot No. 8.— Age, 50 years; yield, 10.9 cords per acre; average height of dominant trees, 45 feet. 



Species. 



Propor- 

 tion 

 based on 

 volume. 



Number 

 of trees 

 per acre. 



Diameter breast- 

 high. 



Volume 

 per acre. 



Average 

 annual 



Average. 



Ex- 

 tremes. 



growth 

 per acre. 





Per cent. 



76.4 



21.5 



1.3 



.8 



672 



272 



8 



8 



Inches. 

 3.4 

 2.8 

 4.0 

 3.0 



Inches. 



2 to 5 



2 to 5 



4 



3 



Cubicfeet. 



709 



200 



12 



7 



Cubicfeet. 

 14 18 



Black birch 



4 00 





24 





14 







Total 



100.0 



960 







928 



18 56 











Endeavor, Forest County, Pa.; altitude 1,200 feet; slope 5 per cent north; soil, shallow, rich, residual 

 c lay loam, over flat shale fragments; humus heavy, rich, well decomposed; plot one-eighth acre, in second- 

 growth stand of less than one-fourth acre; density 0.85; reproduction scant; scattered "hemlock, white ash, 

 sugar and red maple, white oak and birch. 



Plot No. 9. — Age, 80 years; yield, 42.2 cords per acre; average height of dominant trees, 75 feet. 



Species. 



Propor- 

 tion 

 based on 

 volume. 



Number 

 of trees 

 per acre. 



Diameter breast- 

 high. 



Volume 

 per acre. 



Average 

 annual 



Average. 



Ex- 

 tremes. 



growth 

 per acre. 



Yellow birch 



Per cent. 



85.4 



8.2 



4.6 



.8 



.6 



.4 



324 

 32 



68 

 84 

 24 

 20 



Inches. 

 7.4 

 7.3 

 5.7 

 3.0 

 3.1 

 3 



Inches. 

 5 to 11 

 5 to 10 

 Ito 9 

 Ito 6 

 Ito 6 

 3 



Cubicfeet. 



3,062 



206 



164 



29 



20 



16 



Cubicfeet. 

 38.28 



Black birch 



3.70 





2.05 



Beech 



.36 





.25 



Bed maple 



.20 



Total 



100.0 



552 







3,587 



44.84 











Homer Township, Potter County, Pa.; altitude 1,600 feet; slope 30 per cent west; soil very scant, rich, 

 fresh, residual clay, over talus of flat shale fragments; humus heavy, moist, well decomposed; plot one- 

 fourth acre, in similar stand of more than 10 acres; density 0.9; reproduction scant; beech, red maple, 

 hemlock. (See PI. X, fig. 1.) 



MAPLE PLOTS. 



New York. 



Plot No. 10.— Age, 39 years; yield, 28 cords per acre; average height of dominant trees, 68 feet. 



Species. 



Propor- 

 tion 

 based on 

 volume. 



Number 

 of trees 

 per acre. 



Diameter breast- 

 high. 



Volume 

 per acre. 



Average 

 annual 



Average. 



Ex- 

 tremes. 



growth 

 per acre. 





Per cent. 

 77.9. 

 8.3 

 7.6 

 2.8 

 1.8 

 1.6 



712 

 56 

 32 

 16 

 32 

 8 



Inches. 

 4.4 

 5.1 

 6.3 

 5.5 

 3.3 

 6.0 



Inches. 

 Ito 9 



4 to 6 



5 to 8 

 5 to 6 

 3 to 4 



6 



Cubicfeet. 

 1,852 

 198 

 1S1 

 66 

 42 

 39 



Cubicfeet. 

 47.49 



Yellow birch 



5.08 



Fire cherry 



4.64 



Service berry 



1.69 



Ironwood . . . 



1.08 



Basswood 



1.00 







Total 



100.0 



856 







2,378 



60.98 













Cooks Falls, Delaware County, N. Y.; altitude 1,300 feet; slope 15 per cent east by north; soil moist, 

 sandy loam, relatively deep; humus 1 inch thick; plot one-eighth acre in similar stand of 2 or 3 acres; den- 

 sity 1; reproduction, sugar maple and beech; maple very abundant but badly suppressed; an "old field " 

 stand of seedling origin. 



