318 JOURNAL OF FORESTRY 



that there is not much difference in weight of bark between a chestnul 

 oak and a black oak of the same size. Hemlock bark is usually esti- 

 mated by the local cruiser on the basis of a ton to 2,000 to 2,500 board 

 feet of sawtimber, but the use of a volume table is preferable. 



Acidzi/ood. 



Chestnut acidwood, which is sold by the long cord (160 cubic feet, 

 stacked), is also tallied in a "no-log" column, and the volume computed 

 by estimating the number of trees to the cord or preferably by means 

 of a volume table. When the market is good and the utilization close, 

 there must be taken into consideration the acidwood in the tops of 

 sawtimber chestnuts, and in the stems of trees which are only partly 

 usable for saw stock. The tops may be lumped off at an estimated 

 number per ton, or computed by special crown tables if these are avail- 

 able. When a tree contains both sawlogs and stem acidwood, it can be 

 tallied in "no-log" columns with the trees containing acidwood only, 

 and the sawlogs in a special column by diameter at small end. The 

 amount of sawtimber tallied in this special column has to be converted to 

 long cords and subtracted from the contents of the "no-log" column 

 to arrive at the net amount of acidwood. Improved chestnut cordwood 

 tables on the basis of d.b.h. and quality classes are also being pre- 

 pared in the Forest Service. 



FIELD practice; 

 Organisations. 



The standard organizations for strip surveys work out very well 

 in the southern Appalachians. A party chief can supervise efih- 

 ciently the work of three to six crews. Each crew is composed of 

 two men, one to estimate and map, the other to run compass and tally. 

 Three men can work together in doing extra estimating in the coves, 

 as has been explained. The party chief can often make the third man 

 on the cove crew, but when a compassman is released from field work 

 by placing two estimators on a cove crew, he can always be used to 

 advantage on computing or odd jobs in the office. The party chief can 

 make his work most effective by delegating the business management' 

 of the camp to other members of the party, and devoting the largest 

 share of his time to supervising the technical part of the work. 



Width of Strip. 



It has been found necessary to use special care in checking the 

 width of the strip because of the frequent changes in the character of 



