INTERCEIXULAR CANALS 259 



A specimen of "purple heart," Peltogyne sp. (Yale No. .-^'-^' *^^"^ 

 Barbados, origin believed to have been Demerara, s^ '^^ ^ concentric 

 row of vertical ducts, presumably traumatic. 



Hardzmckia binata has, according to ^^'- S. Jones (1?), pathological 

 secretory cavities "arranged closely side by side in a peripheral order, 

 much as one finds the secretory cavities in Eucalyptus." Solereder (3, 

 p. 905) says: "According to my own investigation, Hardzvickia binata 

 Roxb. has secretory cavities only (situated in the primary cortex and 

 sometimes also in the pith and parenchymatous pericycle), interxylary 

 secretory canals being absent." 



With possibly one exception noted in the former paper (p. 433) 

 only vertical canals have been observed in the Leguminosae. They 

 are of two classes: (1) those occurring normally as in Copaifera, 

 Dauicllia, Epcrua, Kingiodcndron, Prioria, Oxystigma, and Swdora; 

 (2) those of traumatic origin or gummosis type as in Andira, Hard- 

 zvickia, Heruiinicra, Hymencca, and Peltogyne. 



Lythracccc. — Schizogenous canals in the rays of some but not all of 

 the specimens of Crypferonia paniculata var. leptostachya have been 

 noted by Moll and Janssonius (16, III, p. 585). No ducts were found 

 in C. paniculata. 



Malvacea. — \^on Hohnel (21, p. 42) says that he found in the wood 

 of Thcspesia popidnea many secretory cavities with orange-yellow 

 (resinous?) contents, which in the dry wood is homogenous and fills 

 the entire cavity. They are situated in the wood parenchyma and the 

 medullary rays, solitary or in short rows. The present writer assumes 

 that what is meant is that the ducts are vertical and in their lysigenous 

 development interrupt the rays but do not run horizontally in the rays. 

 The latter are given as 5-10 cells high and 2-3 cells wide. 



Mcliacecc. — Vertical canals such as described for Szvietenia mahagoni 

 have been noted by the writer in S. macrophylla, S. candollei, Carapa 

 guianensis. and Khaya scncgalcnsis. 



Moll and Janssonius (16, pp. 116, 129, 135) report vertical schizo- 

 lysigenous canals in Melia bogoriensis, Sandoricum indicum, Carapa 

 obovata, Cedrela febrifuga vars. glabrior and velutina. 



Dixon (18, p. 447) says of Szmetenia mahagoni on cross section: 

 "Laminar parenchyma 1-12 cells thick, sometimes containing inter- 

 cellular spaces, containing dark substance, in tangential series." Same 

 (p. 449) re. Cedrela odorata: "Laminar parenchyma 2-6 cells thick, 



