SCIENCE AND THE BOOK 2771 
get is a close approach to certainty, and with this we 
must be content. In many matters, indeed in most 
matters, we must trust the judgment of others who 
are better trained in a particular line of thought. 
As to the truth of geology we are certainly wise 
to accept for the present the facts and principles com- 
monly accepted by competent geologists. In biology, 
we should respect the concurrent opinion of impor- 
tant biologists. We must not assume that a few 
biologists who think as we do are right against the 
biological world, or that a few geologists who think 
as we do are right against the geological world. For 
theology, we had better go to the educated theo- 
logian. But when it comes to reconciling two of 
these and to catching the inherent correspondence 
between them, it is often likely that each of these 
groups of men is unable to see clearly the view-point 
of the other. Here lies our freedom. Here we must 
either think for ourselves or think with those wiser 
than ourselves whose opinions seem to us to ring true 
and to focus for us our wavering and uncertain 
thought. 
Among students of animals and plants there is 
no longer any question as to the truth of evolution. 
That the animals of the present are the altered ani- 
mals of the past, that the plants of to-day are the 
