on Green Leaves and other Parts of Plants. 183 
authenticated instance in which a body renders oxygen active 
previously to its being made use of to form a neutral oxida- 
dation-product of the body itself. To sum up, therefore, the 
reaction with aniline in leaves, & c., coupled with the purely 
chemical reactions, would seem to restrict us to one of the 
following alternatives : — Either there is some more active form 
of oxygen than that in ordinary air present in many, if not in 
all, living green and other cells ; or there is present some 
oxygen-carrier which is at the same time an oxygen intensifies 
thus bringing about the necessary physiological respiration. 
Though the conclusions at which we have arrived are some- 
what indefinite, we venture to think that the experiments we 
have described may tend to elucidate the important subject to 
which they refer. 
