ON SOME N.S.W. TAN-SUBSTANCES. 275. 



Qualitative Tests— Notes — (Third Supplement). 



1. After the present paper I do not propose to continue these 

 voluminous schedules of qualitative tests of tan-substances. My 

 object in presenting them has partly been to show that the reactions 

 of the species of agenus often differ considerably amongst themselves,, 

 so that it is absurd, as is the case in some text-books, to give a 

 reaction with "Mimosa bark," "Eucalyptus bark," as if it were 

 quite generic. Characteristic re-actions will, however, continue 

 to be noted. 



2. Column 2a. E. piperita var., was the only one which gave 

 a precipitate at once. 



3. Column 4ta. Where "no change" is stated, the only action 

 of the Ferric chloride is to produce a slight purplish colour. 



4. Column ±b. When Ammonia is added, the liquids in which 

 no precipitate exist are turned brown in colour. 



5. Column 5. Precipitates form at once in all cases. With E. 

 viminalis, E. jmlyantltemos, and E. Gurinii (Delegate), the 

 precipitate is but slight. 



6. Column 6. A precipitate is given in all cases with the 

 exception of E. viminalis and A. longifolia. 



7. Column 8a. No immediate change in any case, E. stellulata 

 and E. haemastoma excepted. Colours of precipitates taken on 

 standing. 



8. Column 8b. In this case also the precipitates were taken on 

 standing, the only leaves giving precipitates at once being J... 

 vestita and E. amygdalina (Bombala). 



9. Columns da and 11. Precipitates were given at once, 

 colours &c. were noted on standing. 



