PROCEEDINGS OF SECTION B. 89 



solutions in cold water, more or less distinctly according to the quantities 

 of Aromadendrin and Eudesmin which they contain. They all gela- 

 tinize in tinctures, but not so quickly as do the kinos of Class I., and 

 the astringency value as determined with potassium permanganate 

 is considerably less also, ranging between 300 and 450 (gallo-tannic 

 acid = 1,000). The kinos of the following species fall into this class, 

 although naturally a few of them are tending towards the intermediate 

 section : — 



E. melliodora E. Bridgesiana E. fasciculosa E. Maideni 

 E. longifoUa E. viridis E. corynocalyx E. leucoxylon 



E. quadrangu- E. odorata E. Macarthuri E. cornuta 



lata E. punctata E. cinerea 



E. camphora 



The kinos of the typical " boxes " may be considered to form a 

 sub-group to Class II. They give with ferric chloride a reddish to 

 purjjlish-brown colouration at once, soon becoming lighter at the top 

 of the tube ; after a time a very slight precipitate forms. The other 

 reactions are similar to those of Class II., but they give slight precipi- 

 tates with iodine. They do not readily dissolve in cold alcohol, and 

 form turbid solutions in cold water ; they contain a considerable 

 amount of Eudesmin and but a small quantity of Aromadendrin. 

 Their astringency value is very low in comparison with those of the 

 other classes, ranging between 200 and 300. They gelatinize very 

 slowly by the formahn test, and probably would not jelly in tinctures. 

 Eepresentative of this sub-group are — 



E. hemiphloia E. Woollsiana E. albens 



E. corynocalyx also closely approaches these, and might perhaps 

 be included in this sub-group, although the astringency value is a little 

 too high. 



Class III. 



The third class of eucalyptus kinos with distinctive characters 

 are exuded by only a comparatively few of the species so far tested. 

 They do not gelatinize in tinctures, and have nearly as high au 

 astringency value as those of Class I. The Idnos of E. calophylla and E. 

 microcmys are good representatives of this class, the latter being the 

 best and most distinctive, as that of the former is tending towards 

 the intermediate section. They give a blue colouration with ferric 

 chloride — almost identical in most cases with that given by gallo- 

 tannic acid itself — slowly changing to a blue-violet tinge towards the 

 top of the tube, and inclining \s olive-green at the bottom ; after a 

 time there is obtained a copious blue-black precipitate. Iodine gives 

 scarcely any precipitate even on long standing, and this is also the 

 case with bromine water. Lime water gives a pink colouration and 

 dense precipitate, which reaction is distinctive from the purplish 



