4. The knave in any of the four suits of cards (1662).
8. A term of contempt.
10. A sailor
11. A stranger.
17. A male: jackhare, jack-crow, jack-ass, jackrabbit, etc. (1563).
18. An ape.
19. A peasant (1513).
— Slang and its analogues
I think that to all living things there is a pleasure in the exercise of their energies, and that even beasts rejoice in being lithe and swift and strong. But a man at work, making something which he feels will exist because he is working at it and wills it, is exercising the energies of his mind and soul as well as of his body. Memory and imagination help him as he works. Not only his own thoughts, but the thoughts of the men of past ages guide his hands; and, as a part of the human race, he creates. If we work thus we shall be men, and our days will be happy and eventful.