30 HENRY G. SMITH. 



apparently, of the greatest value for discriminative purposes 

 between the several groups and tannins of Eucalyptus kinos. 



1. Ferric chloride. 



2. Ferric acetate. 



3. Bromine water. 



4. Iodine in potassium iodide. 



5. Potassium dichromate. 



6. Cobalt acetate. 



7. Zinc acetate. 



8. Uranium acetate. 



9. Calcium hydrate. 



10. Cupric sulphate and afterwards ammonia in excess. 



Lead acetate was of little value because it gave identical 

 precipitates in solutions of all kinos. 



The solutions of the kinos were all one gram per litre, 

 and all reactions given in this and subsequent papers are 

 with that strength, excepting those with the ferric salts, 

 as these reagents gave reactions more delicate and dis- 

 tinctive when the solutions were further diluted to 1 of 

 kino to 2 parts water, adding one drop of a strong solution 

 of the ferric salt and allowing this to fall through the 

 solution in test tube without agitation. With the kinos of 

 the "Ironbarks," and also with the glucoside, ferric chloride 

 gave a brown-grey coloration becoming much lighter on 

 standing, and a dirty brown-grey flocculent precipitate was 

 deposited after some hours. With ferric acetate, however, 

 the colour was blue with a tinge of violet, and a dense 

 dark blue precipitate quickly formed ; this reaction is 

 identical with that given by the kinos of the " Stringy- 

 barks "and the ''Peppermints" with either ferric chloride 

 or ferric acetate, and it is thus evident that the sugar com- 

 bination prevents the reaction with ferric chloride, although 

 not with ferric acetate. 



The purified glucoside did not give precipitates with 

 either 3 or 4 and the "Ironbark " kinos gave only traces, 



