geology, I should dazzle him by the fully developed law of the
correlation of forces, I should delight him with the cell-doctrine, I
should confound him with the revolutionary apocalypse of Darwinism. All
this change in the aspects, position, beliefs, of humanity since the
time of Dr. Young's death, the date of my own graduation from college!

I ought to consider myself highly favored to have lived through such a
half century. But it seems to me that in walking the streets of London
and Paris I shall revert to my student days, and appear to myself like a
relic of a former generation. Those who have been born into the
inheritance of the new civilization feel very differently about it from
those who have lived their way into it. To the young and those
approaching middle age all these innovations in life and thought are as
natural, as much a matter of course, as the air they breathe; they form
a part of the inner framework of their intelligence, about which their
mental life is organized. To men and women of more than threescore and
ten they are external accretions, like the shell of a mollusk, the
jointed plates of an articulate. This must be remembered in reading
anything written by those who knew the century in its teens; it is not
likely to be forgotten, for the fact betrays itself in all the writer's
thoughts and expressions.

The story of my first visit to Europe is briefly this: my object was to
study the medical profession, chiefly in Paris, and I was in Europe
about two years and a half, from April, 1833, to October, 1835. I sailed
in the packet ship Philadelphia from New York for Portsmouth, where we
arrived after a passage of twenty-four days. A week was spent in
visiting Southampton, Salisbury, Stonehenge, Wilton, and the Isle of
Wight. I then crossed the Channel to Havre, from which I went to Paris.
In the spring and summer of 1834 I made my principal visit to England