367 



The following papers chiefly refer to Venation and Oil. 



H. Gildemeister, E. and Hoffman, Fr. (1899, 1900) " Die iEtherischen Oele. r 

 Svo.. p. 919. Berlin. 1899. Also " The Volatile Oils," by E. Gildemeister and Fr. 

 Hoffman, under the auspices of Schimmel & Co. Translation by Edward Kremers 

 (Milwaukee, U.S.A., 1900, of above.) Pages 524-541 are taken up with Eucalyptus 

 oils. They are divided into five groups, according to their constituents or odour : — 



First Group. Cineol (Eucalyptol) — containing oils — E. globulus (a valuable 

 article on the quantitative determination of Cineol in Eucalyptus oils). E. odorata, 

 E. cneorifolia, E. oleosa, E. dumosa, E. amygdalina, E. rostrata, E. populifolia, 

 E. corymbosa. E. resinifera, E. Baileyana, E. microcorys, E. Risdoni, E. leucoxylon, 

 E. hemvphloia. E. crebra, E. macrorrhyncha, E. capitellata, E. eugenioides, E. obliqua, 

 E. punctata. E. loxophleba (foecunda), E. dextropinea, E. laevopinea, E. Smithii. 



Second Group. Citronellal — containing oils — E. maculata, E. citriodora, E. 

 dealbata. E. Planchoniana. 



Third Croup. Citral-containing oils — E. Staigeriana. 



Fourth Group. Oils with a peppermint-like odour — E. haemastoma, E. piperita. 



Fifth Group. Oils less known and of indefinite odour — E. diversicolor ; 

 E. fissilis, E. goniocalyx, E. gracilis, E. Lehmanni, E. longifolia, E. occidentalis , 

 E. pauciflora (coriacea). E. Stuartiana, E. tereticomis , E. tessellaris, E. Dawsoni, 

 E. camphora. 



I. R. T . Baker and H. G. Smith, 1901. " On the relation between leaf venation 

 and the presence of certain chemical constituents in the oils of the Eucalypts." (Proc. 

 Roy. Soc. N.S.W., xxxv, 116, 1901). 



1. " The venation of Eucalyptus leaves that has perhaps the most scientific importance (my italics, 

 J.H.\L) is that which is characteristic of the 



Bloodwoods (corymbosa, intermedia, eximia, trachyphloia, terminalis) ; 



Swamp Mahoganies (botryoides and robusta) ; 



Blue Gum (saligna), lesselaris, and a few others (not named). 



" : This particular venation is of importance because it is also generally characteristic of the Ango- 

 phoras. This venation .... appears to be indicative of a preponderance of pinene in the oil." 



2. " The venation of the leaves belonging to those species next in order is that which characterises 

 the Eucalvpts yielding Eucalyptol oils. Although tending somewhat towards the venation of that group 

 which give oils containing a predominance of pinene, yet the parallel transverse venation, like that of a feather, 

 which is characteristic of the pinene group, is not marked, and the venation and reticulation are exceedingly 

 delicate, the spaces between the principal veins are larger, and a picture of the leaf has a much more graceful 

 and delicate appearance." 



Then they cite Smithii, globulus, longifolia, goniocalyx, " or of any other allied species which gives a 

 first-class Eucalyptol oil." Some other species (Mallees and Boxes) are incidentally mentioned. 

 E 



