9(| HENRY G. SMITH. 



factory tinctures will unfortunately not now hold, because 

 those Eucalyptus kinos which are, when fresh, completely 

 soluble in cold water as well as in alcohol, are those that 

 gelatinize the most readily. These rapidly gelatinizable 

 kinos are numerous, and are obtained from Eucalypts whose 

 oils contain the terpene phellandrene, such species are 

 E. pilularis, E. piperita, E. amygdalina, (and its allies), 

 E. hcemastoma, E. obliqiia,E.macrorrhyncha,E. Sieberiana, 

 E. oreades, etc. It is a pity that this geiatinization takes 

 place so readily, because these soluble kinos are the most 

 astringent, and when quite fresh are almost as astringent 

 as gallo-tannic acid itself, but owing to the objectionable 

 property of gelatinizing, the whole of the members of this 

 class of Eucalyptus kinos will have to be discarded for 

 tincture making. It should be possible, however, to use 

 them in other directions, but the method by which this 

 could be done is a matter for future determination. Por- 

 tunately there are several Eucalyptus kinos which do not 

 gelatinize in tinctures, and these are almost equally 

 astringent with those kinos mentioned above and are readily 

 obtainable. 



The kinos of the Eucalypts contain at least three tannins 

 determinable by reagents ; two of these gelatinize in tinc- 

 tures, the other does not. Of the two gelatinizable tannins 

 the one which gives the violet colour and precipitate with 

 ferric chloride gelatinizes much more readily than the one 

 which gives a green colour with ferric chloride. 1 It is 

 possible that the tannins in these kinos may be separated, 

 perhaps through their copper salts. 



It was the somewhat regular increment of particular oil 

 constituents in progressive species that enabled the new 



1 The late Mr. Henry Trimble (the author of "The Tannins") expressed 

 an opinion to the author of this paper, that eventually a new tannin 

 might be isolated from the Eucalypts, and the results here recorded 

 support strongly that supposition. 



