90 



PROCEEDINGS OF SECTION B. 



colour and precipitate given by the kinos of Class I. The acetates 

 quickly give precipitates, as does also potassium dichromate. Cuprio 

 sulphite and ammonia in excess give scarcely any precipitate. The 

 very slight reaction with bromine water and the diSerence in colour 

 with the ferric salt are distinctive from the kinos of the second class. 

 From the kinos of .Class I. they dii?er in colour reactions with ferric 

 chloride, and with lime water, and in only forming very slight precipi- 

 tates with bromine water. Their great distinguishing feature is that 

 tinctures made with them do not gelatinize, a feature determined 

 in a few days by the formalin test. The crystalline body they contam 

 io Aromadendrin, and Catechin is also found in some of them. The 

 klaos that fall into this class are derived from the following species :— 



E. calophylla E. tesselaris B. maculata 



E. microcorys E. eximia E. citriodora 



Eucalyptus kinos which are intermediate in character between 

 the several classes may be divided into two groups — {a) those with 

 an astringency value above 600 (gallo-tannic acid = 1,000) ; and (6) 

 those with an astringency value between 450 and 600. The kinos 

 with indefinite reactions which fall into the former are obtained from 

 the following species : — 



E, dumosa 

 E. intermedia 

 E, squamosa 



E. oleosa 

 E. terminalis 



E. corymbosa 

 E. trachyphloia 

 E. clavigera 



while those v.-hich fall into the latter group are derived from the 

 following species : — ■ 



E. populifolia 

 E. micro theca 

 E. paludosd 

 E. occideutalis 

 E. tereticornis 

 E. goniocalyx 

 E. cneorifolia 

 E. Cambagei 



E. Smlthii 

 E. lactea 

 E. incrassata 

 E. rubida 

 E. Bauerleni 

 E. rostrata 

 E. pendula 

 E. globulus 



E. Dawsoni 

 E. aiiinis 

 E. aggregata 

 E. Morrisii 

 E. dealbata 

 E. viminalis 

 E. nova-angiica 

 E. acervula 



The kinos of the intermediate sections usually give green coloura- 

 tions at first with feiTic chloride, some, however, soon incline to a 

 violet-grey according as they approach more closely in constituents 

 those of the Classes I. and II. 



Class IV. 



» 



Kinos of this class may be distinguished by their ready solubility 

 in water, and slight solubiUty in alcohol. They are just as readily 

 soluble in water years after collection, and thus differ from the kinos 

 of Class I. The tannin in this class appears to be, with most of them, 



