204 
HAROLD’S DISCUSSIONS. 
a force which acts in certain ways. IS^obody knows 
what it is. In fact, we know nothing of any force 
except its manifestations in matter. Magnetism, elec¬ 
tricity, chemical affinity, brain power, yes, life itself, 
are all known only to the extent to which they can 
manifest themselves in what we call matter. Quan¬ 
tity can be measured, quality can only be discovered. 
