BELFAST 

 NATURAL HISTORY AND PHILOSOPHICAL SOCIETY. 



PROCEEDINGS, 



SESSION 1919-1920. 



No. 2. 



11th December, 1910, and 

 10th February, 1920. 



^ 



THE DYEING OF PURPLE IN ANCIENT ISRAEL. 



BY REV. ISAAC HERZOG, M.A., D.Lrr. 



CATALYSIS OR THE SPEEDING-UP OF CHEMICAL 

 REACTIONS. 



BY A. KILLEN MACBETH, -M. A., D.Sc, F.I.C., M.R.I.A. 





BELFAST: 



lAYNE, BOYD & SON, LTD., 2 CORPORATION STREET 



(PRINTERS TO THE QUEENS UNIVERSITY). 



1920. ' 



