4f>2 



liquid firsf becomes dark violet, then |)iire blue, after a few minutes 

 the colour has become emerald green. This green colour does not 

 change again, when there is no excess of permanganate present. If 

 the solution of the amino pyridine is somewhat more concentrated, 

 the green colour at once sets in after a transient dark colouring. 



This reaction is characteristic of amino pyridine and very sensitive. 

 In acetyl amino pyridine this colour reaction does not set in at the 

 ordiiiarj' temperature until after some hours, soon however on boiling. 



Whether the acetyl rest is split off primarily here, has not yet 

 been examined. 



A more detailed account of the observations discussed briefly here 

 will be published in the Recueil des Travanx chimiques. 



