You are not going to sleep upon your laurels.

Oh, if I had only had your fortune when I had your youth! I would have dedicated my days to pure science, instead of losing the best part of them among those poor young men who got nothing from my lectures but an opportunity to read Paul de Kock.

I would have been ambitious!--I would have striven to connect my name with the discovery of some great general law, or at least with the invention of some very useful apparatus.

It is too late now; my eyes are worn out, and the brain itself refuses to work.

Take your turn, my boy! You are not yet twenty-six, the Ural mines have given you the wherewithal to live at ease, and, for yourself alone, you have no further wants to satisfy; the time has come to work for humanity.