even to cancel altogether their gravity-bound existence.

To see things in this light is to realize that with our having become
able to rouse electricity and magnetism from their dormant state and
make them work for us, a gigantic responsibility has devolved upon
mankind. It was man's fate to remain unaware of this fact during the
first phase of the electrification of his civilization; to continue now
in this state of unawareness would spell peril to the human race.

The fact that modern science has long ceased to be a 'natural' science
is something which has begun to dawn upon the modern scientific
researcher himself. What has thus come to him as a question finds a
definite answer in the picture of electricity we have been able to
develop. It is again Eddington who has drawn attention particularly to
this question: see the chapter, 'Discovery or Manufacture?' in his
Philosophy of Physical Science. It will be appropriate at this point to
recall his remarks, for they bear not only on the outcome of our own
present discussion, but also, as the next chapter will show, on the
further course of our studies.

Eddington starts by asking: 'When Lord Rutherford showed us the atomic
nucleus, did he find it or did he make it?' Whichever answer we give,
Eddington goes on to say, makes no difference to our admiration for
Rutherford himself. But it makes all the difference to our ideas on the
structure of the physical universe. To make clear where the modern
physicist stands in this respect, Eddington uses a striking comparison.
If a sculptor were to point in our presence to a raw block of marble
saying that the form of a human head was lying hidden in the block,
'all our rational instinct would be roused against such an
anthropomorphic speculation'. For it is inconceivable to us that nature