The Descent of Man and Other Stories

When Professor Linyard came back from his holiday in the Maine woods the air of rejuvenation he brought with him was due less to the influences of the climate than to the companionship he had enjoyed on his travels. To Mrs. Linyard's observant eye he had appeared to set out alone; but an invisible traveller had in fact accompanied him, and if his heart beat high it was simply at the pitch of his adventure: for the Professor had eloped with an idea.