380 PEOrESSOE BUNSEN AND DE. H. E. EOSCX)E’S PHOTO-CHElinCAE EESEAECHES. 
rine and hydrogen mixture, we shall describe experiments in which the influence of the 
atmospheric pressure is corrected. 
In the next Part we shall consider the relations of Photo-chemical Induction, under 
which term we class a number of phenomena which open a new and most interesting 
field of investigation, and are connected in an intimate manner with catalytic actions. 
