438 JOURNAL OF FORESTRY 



dendron gandichaudii and C. platyphyUnm, from Hawaii, and Didymo- 

 panax morototoni, from the Canal Zone and Argentina. The first two 

 were first noted by Brown (13). 



Viguer (14) considered Arthophyllum diver si folhun unique among 

 the Arahacese on account of peculiar cavities noted in the rays which 

 he calls "poches secretrices." The present writer has had no oppor- 

 tunity to examine the wood of this species, but from Viguer's drawing 

 it appears certain that these so-called secretory cavities are ducts such 

 as found in the other species mentioned above. This is also the opinion 

 of Solereder (2, p. 946). 



StyracecB 



According to Tschirch (4, p. 1199), vertical canals appear in the 

 wood and bark of Styrax benzoin as the result of injury, but do not 

 occur normally. They arise schizogenously in the zone of new wood 

 nearest the old, and are later enlarged lysigenously until a continuous 

 tangential network results about the rays, some of which, in fact, are 

 also partially or entirely broken down. 



Canals also develop in the bast and communicate with those in the 

 wood through the rays. These radial canals, which are also schizo- 

 lysigenous, arise in the cambium, where they are very small, and enlarge 

 progressively from it. 



Boraginacece 



The writer found vertical canals, presumably of pathological forma- 

 tion, in certain specimens of Cordia sp. from Colombia and Venezuela. 

 In the Venezuelan wood known as "pardillo" the canals are situated in 

 a zone of wound parenchyma, are filled with a clear yellow balsam in 

 which are embedded numerous free parenchyma cells, or small groups 

 of them, which have evidently become detached during the lysigenous 

 enlargement of the ducts. In some places the detachment is not com- 

 plete. In other places the partial disintegration of the limiting cells is 

 clearly shown. , * 



Compositcu 



Vertical secretory canals are reported in the secondary wood and bast 

 in the tubers of Helianthus tuberosus and horizontal ducts in the rays 

 of the secondary wood and bast in the fleshy roots of Dahlia. 



Secretory cavities in place of canals have been reported in the bast 

 and wood in the root and rhizome of Iinila helcninm and in the rays of 

 bast and wood in Anacyclus pyretlinim and Carlina acaulis (Solereder, 

 2, pp. 956-7). 



