The Log of a Sea-Waif: Being Recollections of the First Four Years of My Sea Life.

p. 20: There were no books on board of reading matter of any kind, except the necessary works on navigation on the captain’s shelf; so it was just as well that I could take some interest in our surroundings, if I was not to die mentally as most of the sailors seemed to have done…. they seemed totally ignorant of anything connected with the wonders of the sea.