the future, or of the aim and end
to which their special labor is contributing. These often consider and
call themselves practical men. They pull the oars of society, and have
no leisure to watch the currents running this or that way; let theorists
and philosophers attend to them. In the mean time, however, these
currents are carrying the practical men, too, and all their work may be
thrown away, and worse than thrown away, if they do not take knowledge
of them and get out of the wrong ones and into the right ones as soon as
they may. Sir Edward Parry and his party were going straight towards the
pole in one of their arctic expeditions, travelling at the rate of ten
miles a day. But the ice over which they travelled was drifting straight
towards the equator, at the rate of twelve miles a day, and yet no
man among them would have known that he was travelling two miles a day
backward unless he had lifted his eyes from the track in which he was
plodding. It is not only going backward that the plain practical workman
is liable to, if he will not look up and look around; he may go forward
to ends he little dreams of. It is a simple business for a mason to
build up a niche in a wall; but what if, a hundred years afterwards when
the wall is torn down, the skeleton of a murdered man drop out of the
niche? It was a plain practical piece of carpentry for a Jewish artisan
to fit two pieces of timber together according to the legal pattern in
the time of Pontius Pilate; he asked no questions, perhaps, but we know
what burden the cross bore on the morrow! And so, with subtler tools
than trowels or axes, the statesman who works in policy without
principle, the theologian who works in forms without a soul, the
physician who, calling himself a practical man, refuses to recognize the
larger laws which govern his changing practice, may all find that they
have been building truth into the wall, and hanging humanity upon the
cross.

The truth is, that medicine, professedly founded on observation, is as
sensitive to outside influences, political, religious, philosophical,
imaginative, as is the barometer to the changes of atmospheric density.
Theoretically it ought to go on its own straightforward inductive path,
without regard to changes of government or to fluctuations of public
opinion. But look a moment while I clash a few facts together, and see
if some sparks do not reveal by their light a closer relation between
the Medical Sciences