258 JOURNAL OF FORESTRY 



Tenninalia is the only genus of this family in which ducts have been 

 noted. Since they are traumatic they are likely to l3e absent, particu- 

 larly in small specimens. 



Cornacecc. — The presence of numerous vertical ducts occurring nor- 

 mally in the secondary M^ood of Mastixia trichotoma and M. rostrata 

 has been noted by Moll and Janssonius (Id, III, p. 438). Some authors 

 classify Mastixia under the Dipterocarpacse, but the structure of the 

 vi^ood, except for these ducts, indicates Cornacese. In this connection 

 see also Solereder (2, p. 438). 



Mastixia is the only genus in which canals have been noted. 



Hamamelidacca\—Mo\\ and Janssonius (Ifi, III, pp. 304, 321) 

 found schizo-lysigneous vertical ducts in single concentric rows at the 

 limit of growth rings in Altingia excelsa. Radial canals were not found. 

 In the variety excelsa, however, schizogenous canals were present in 

 a few of the rays of all three specimens examined (16, III, pp. 318, 

 323). 



Vertical canals of the gummosis type have been noted by the present 

 writer and others in Liquidamhar spp. (see former paper p. 433). The 

 only reference to canals in the rays is by Moeller (6, p. 13), who claimed 

 to have found secretory cavities in the bark in communication with 

 vertical canals in the wood. 



In her paper on storax production of the red gum, Liquidambar 

 styracifliia, Miss Gerry (27, p. 19) says: "In the wood formed after 

 tapping, abnormal structures from which storax exudes were produced 

 near the wound. These are similar to the induced vertical resin ducts 

 found in turpentined pines. No horizontal gum ducts were formed." 



Leguminoscc. — A small block of 'wood of Andira savananim (Yale 

 No. 2988) from Panama contains vertical gum ducts with reddish 

 contents ; they are evidently traumatic. 



A Philippine wood specimen of Sindora inennis (Yale No. 2355) 

 shows vertical ducts normally as in 5^. supa previously described (for- 

 mer paper, p. 434). The same is true, according to Moll and Jans- 

 sonius (16, III. pp. 142, 144), of Sindora sumatrana. 



Two specimens of Hyniencea courbaril, one from Costa Rica (Yale 

 No. 2697), the other from the Amazon region of Brazil ("L. Agassis" 

 col. No. 35), contain vertical ducts which are presumably of traumatic 

 origin. 



