ABSENCE OF GUM AND PRESENCE OF A NEW DIGLUCOSIDE. 29 



indicated in two directions, assuming of course a probable 

 value for the tannin molecule, first by the actual amount 

 of sugar and " kino red" obtained, and secondly by the 

 relative astringency value of kinos containing a maximum 

 amount of the glucoside, when compared with that of the 

 non-glucosidal kinos containing the same tannin. 



The name Emphloin is proposed for this Eucalyptus kino 

 diglucoside, because of its being ostensibly a bark product, 

 which often accurs in great abundance throughout the bark 

 of certain species. I would like to reserve to myself the 

 further investigation of the sugar. 



Experimental. 



The glucosidal kinos of the " Ironbarks," of which that 

 of E. paniculata may be considered a type, are, when 

 freshly exuded, transparent, and of a red garnet colour, 

 but become much darker after exposure to light and air. 

 They are exceedingly tough when fresh and air dried, but 

 become less so by age, and are very brittle and readily 

 powdered when the water has been driven off. They 

 usually contain about 18 to 20 per cent, of water, but a 

 little more when quite fresh. The " Ironbark " kinos con- 

 sist almost entirely of the glucosidal tannin ; this is shown 

 by the relative astringency of the original kino, and of the 

 purified glucoside ; also by the colour reactions with ferric 

 chloride, all of which indicate the absence of but a small 

 amount of free tannin. 



Astringency value of kino, E. paniculata containing 22*78°/° 



water = 412. 

 Astringency value of purified glucoside containing 11*75°/° 



water = 423. 

 Glucoside corrected for 22 , 78°/° water = 371. 



Reactions ivith reagents, — After experimenting with a 

 number of reagents, I have chosen the following, as being 



