In due course I proceeded to Edinburgh to visit the Scotch
Universities—I made the acquaintance, on board the steamer,
of a “young fellow”—Dr. Greville, the botanist: his great
work on the _Cryptogamia_—Dr. Robert Knox, whose calling
and whose hobby were one—His enthusiasm and geological
foresight—Physic is seldom a hobby—Aberdeen and Principal
Jack—St. Andrew’s—Glasgow College and its professors 72