Plate III 



Fig. 1. — A face from the double-chipped area, Columbia, Miss., in November, 1917, at the end of a 2- 

 year operation. Tree freshly chipped, dry-facing beginning at peak, gum exuding well at shoulder or 

 corner. Droplets indicate the position of resin passages. 



Fig. 2. — A face from the narrow-chipped area, Columbia, Miss., in November, 1917, at the end of a 2- 

 year operation. Tree freshly chipped. Abundant exudation all along the streak. Each droplet at a 

 resin passage, clusters and lines of droplets indicate series of resin passages. Fourteen or more annual 

 rings of sapwood exposed and participating in the yield. 



