116 Proceedings of the Royal Irish Academy. 



^-Dipiperonylidene-diaceto-orcinol crystallises from boiling xylene in yellow 

 prisms, which soften at 245' C, and melt at 248-249^^ C. It is much less 

 soluble in the usual organic solvents than the a compound, and appears to 

 be quite insoluble in potash. Its behaviour towards concentrated sulphuric 

 acid, is similar to that of the « compound, whilst ferric chloride produces a 

 somewhat fainter colour than that obtained with the latter. 



