2G2 JOURNAL OF FORESTRY 



Siniariihacccc. — \>rtical ducts in concentric series appear to be a 

 fairly constant feature in the Brazilian "pao parahyba" or "marupa," 

 Simaruha amara. The wood is nearly white, rather light and soft, and 

 has distinct ripple marks. 



Moll and Janssonius (16, II, p. 81) found vertical schizo-lysigenous 

 canals in the layers of wood parenchyma in Ailanthtis malaharica. 



The occurrence of resin canals solely at the periphery of the pith 

 in these two genera and at least nine others has been noted by various 

 investigators (2, pp. 186-T; 8(51). Mucilage cavities have been found 

 in the pith of certain genera. 



Stercnliacecc. — Vertical canals in a compact tangential row have been 

 noted by the writer in a specimen of the Philippine "lumbayao," Tar- 

 rietia javanica (Yale No. 11 GO). They are much like those found in 

 the Meliaceje, are filled with dark reddish contents which make the 

 layer prominent on longitudinal surfaces. 



Solereder (2, p. 845) records the "occurrence of interxylary 

 mucilage-canals in the older portions of the axis in Brachychiton popul- 

 neum and Theobroma Cacao (Mangin)." Mucilage cavities have been 

 observed in the wood (in the wood parenchyma or in the medullary 

 rays) of the root in Sferculia Balanghas, S. foetida, S. "monophylla," 

 S. platanifolia, Brachychiton acerifoliiiin, and B. populneum. 



According to Jones (IT, p. 108) : "Hcriticra Foiues is another tree 

 which seems to form interxylary cavities very frequently. These are 

 also arranged peripherally, and when a number of rows appear in a 

 cross section there is a slight danger of confusing them with open 

 tissue marking commencement of periodic growth." 



Vochysiacecc.—ln this family, according to Solereder (2, p. 101:), 

 "secretory organs . . . are represented by lysigenous mucilage- 

 canals and mucilage cells, found in the axis. The mucilage-canals are, 

 as a rule, present only in the pith. . . . The gum-canals of the 

 wood, stated by Wille to occur in Qiialea Lundii, Warm., appear to be 

 of a pathological nature." 



The present writer found vertical gum-ducts in a specimen of 

 Vochysia guatcinalcnsis (Yale No. 3:08) from the Guatemala-Hon- 

 duras boundary. In one place they are in a double layer and rather 

 prominent. This wood is light and soft Avith abundant parenchyma. 



