ON SOME N.S.W. TAN-SUBSTANCES. 207 



Qualitative Tests — Notes — (Second Supplement). 



1. Cobalt acetate has been substituted for Ammonium sulphide. 

 The unsatisfactory nature of the reactions yielded by the latter 

 has been already alluded to. 



2. The solutions of leaves (Rlius, Eremophila and Polygonum) 

 yield a green filtrate with ammonio-sulphate of copper (column 9). 



3. The precipitates yielded by E. amygdalina kino are usually 

 darker than those yielded by E. stellulata and E. piperita under 

 the same circumstances. 



4. The following statement has been made, and has been copied 

 into several English and American works: — "The tannin of 

 Banksia serrata imparts a beautiful violet-blue colour to solutions 

 of ferric salts." I cannot confirm this observation. The violet 

 tint is of the most transient nature, and the colour is more brown 

 than anything else. See column (4) in schedule. When the 

 ferric-chloride is moderately concentrated a pure brown precipitate 

 is the result. Precipitates form in most cases with this re-agent 

 unless it be dilute. 



5. Ammonium nitro-molybdate darkens the liquid in every case, 

 producing various shades of olive greens and olive-browns, chiefly 

 the former. In the case of three of the kinos E. stellulata, E. 

 amygdalina, and E. piperita, there is in addition an exceedingly 

 abundant gelatinous precipitate, which sets to a firm jelly on 

 standing, so that the test-tube can be inverted without any danger 

 of loss of its contents. This is more particularly marked with 

 E. piperita. 



