nr CEYLON. 7 



believed that the coloured body filling the lufhuna of the 

 secondary xylem elements was neither a gum nor a resin, 

 but one of unknown and singular chemical composition. 

 This subject was then taken up by Belohonbek* and 

 Hohnel,t the former concluding, after a detailed chemical 

 analysis, that the black contents of the timber, soluble in 

 alkali, were mainly humus acids, and the remaining material, 

 insoluble in alkali, more or less pure carbon. 



Moeller made another contribution at about the same time 

 dealing with the anatomy of the bark, and the origin layer 

 of the phellogen. SolerederJ also made additions to our 

 knowledge on the same subject, and described the histological 

 details of the secondary elements and the papillae on the 

 under surface of the leaves of many species. Radlkofer 

 discussed the value of internal characters, and stated that in 

 the Ebenace* the affinity so apparent in the flowers may be 

 reflected in the anatomical construction of the vegetative 

 parts. In the same year Weissj] and Giirkef published 

 works on the Ebenaeeae ; the former dealing with the nature 

 and origin layer of the phellogen and its products, and the 

 latter discussing the leading anatomical and morphological 

 characters as known to him. 



In 1892 the last anatomical contributions to our knowledge 

 of the Ebenaeeae were made by Pomrencke** and Parmen- 

 tier,f t th former dealing comparatively with the timbers, 

 and the latter giving a detailed account of the anatomy of the 

 vegetative members of very many species. The contribution 



* Belohonbek, Ebenhofc, in Sitib. K. bohm. Gesellsch. d. Wiss in Frag- 

 1-3. 



t Hohnel, Stockwerkart Holxk., in Siteb. Wiener AkaeL Bd. LXXXIX.. 

 Abe. 1, p. 42, 1884. 



t Solereder. Holzstruktur, 1883. pp. 68-169. 



Radlkofer, Dnrehs. P. in Siteb, Munch. AlowL, 1886, p. 323. 



| Weiss, Korkbild., in Denteehr. Begensb. bot. Gesellsch, 1890, p. 57. 



f Gurke, in Hat Pfi^ IT. Theil, Abth. 1, 1890. 



** Pomrencke, Holx. einig. gymp. Fain, in Arb. bot, Gart. Breslau. 1892, 

 p. 49-51. 



ft Pannentier, Hfetologie comparee des Ebdnacees. Paris, 1892. ISSfigsu, 



