PLATE 4. 



Fig. a. Wounded wood of the stem of Agathis australis in transverse section, 

 showing the return of the ancestral wood parenchyma as the result 

 of injury. X 100. 



Fig. b. The same in radial section. X 100. 



Fig. c. Wood of Agathis australis (normal) in transverse section, showing 

 plugging of tracheids in proximity to the rays. X 40. 



Fig. d. The same in tangential longitudinal section, showing relation of plugs 

 to the ray cells. X 40. 



Fig. e. Transverse section of the wood of Araucarioxylon noveboracense, for 

 comparison with Figure c. X 40. 



Fig. /. Tangential section of the same for comparison with Figure d. X 40. 



