YIELD OF EVEN-AGED HARDWOOD STANDS. 39 



Table 26. — Yield per acre in cords— chestnut, oak-chestnut, and oak types. 





Chestnut type. 



Oak-chestnut type. 



Oak type. 



Age. 



Quality 

 I. 



Quality 

 II. 



Quality 

 III. 



Quality 

 I. 



Quality 

 II. 



Quality 

 III. 



Quality 

 I. 



Quality 

 II. 



Quality 

 III. 



Years. 

 15 



16 



23 

 30 



37 

 43 

 48 

 53 

 57 

 61 

 63 

 66 

 68 

 70 



12 

 18 

 24 

 30 

 35 

 40 

 43 

 46 

 49 

 51 

 53 

 55 

 57 



9 

 13 

 18 

 23 

 27 

 31 

 34 

 37 

 39 

 41 

 42 

 44 

 45 



12 

 19 

 28 

 36 

 41 

 46 

 49 

 53 

 56 

 59 

 62 

 64 

 66 



10 

 16 

 22 

 28 

 33 

 36 

 40 

 42 

 45 

 47 

 49 

 51 

 53 



8 

 12 

 17 

 20 

 24 

 27 

 30 

 32 

 33 

 35 

 37 

 38 

 39 



9 

 15 

 23 

 30 

 36 

 40 

 44 

 48 

 51 

 53 

 55 

 58 

 60 



8 



12 

 18 

 24 

 28 

 32 

 35 

 38 

 40 

 43 

 45 

 47 

 48 



6 



20 



10 



25 



14 



30 



17 



35 



21 



40 



24 



45 



26 



50 



29 



55 



30 



60 



32 



65 



34 



70 



35 



75 



36 







LUMBER — CHESTNUT TYPE. 



To obtain the figures given in Table 27 the individual sample 

 plots were scaled by the board-foot volume Tables 42-44, Appendix, 

 for chestnut and oak. In scaling the plots it was necessarily assumed 

 that every tree large enough for lumber was sound, straight, and clear 

 enough to produce the amount of lumber given in the table for the 

 corresponding diameter and height. The yields must therefore be 

 considered ideal, and should be discounted for a given stand accord- 

 ing to the variation in straightness, soundness, and clearness of the 

 timber. Since the trees upon which the volume tables are based 

 were not of the first quality, it is probable that a discount of from 10 

 to 15 per cent would, in most cases, be sufficient. The yields include, 

 besides chestnut, the proportion of oak lumber, never exceeding 40 

 per cent, which commonly exists in stands of the chestnut type. The 

 volume in " additional cord wood" is that from trees too small to cut 

 into lumber, and from tops and branches of logged trees, and is 

 derived from the volume in cubic feet of "topwood" given in Tables 

 42-44, together with the volume in cubic feet of all the trees in the 

 plot under 9 inches diameter breasthigh scaled by Tables 38-40. The 

 resulting total volume per acre in " cubic feet additional" in this and 

 succeeding tables is converted into cords by dividing by 80, the 

 number of solid cubic feet which it was assumed that a cord of small 

 trees, tops, and branches would contain. 



