O74 Scientific Proceedings, Royal Dublin Society. 
opportunities now and then turning up within each tiny speck of 
so Protean a material as protoplasm, a body of which the mutations 
have probably time-relations of the same order as those we have 
been endeavouring to illustrate, and whose activities are therefore 
more incessant, more various, and more complex, within every 
thousandth of a second, in every speck and corner of each living 
cell, than the mind can even conceive. It is very little man yet 
knows of what is going on abundantly about him in every stick 
and stone. 
