The formation of different languages and of distinct species and the proofs that both have been developed through a gradual process, are curiously parallel.

Mathematics seems to endow one with something like a new sense.

But Geology carries the day: it is like the pleasure of gambling, speculating, on first arriving, what the rocks may be; I often mentally cry out 3 to 1 Tertiary against primitive; but the latter have hitherto won all the bets.

I agree with Agassiz that dogs possess something very like conscience.

I fully subscribe to the judgement of those writers who maintain that of all the differences between man and the lower animal, the moral sense of conscience is by far the most important....It is the most noble of all the attributes of man.

Besides love and sympathy, animals exhibit other qualities connected with the social instincts which in us would be called moral.

What wretched doings come from the ardor of fame; the love of truth alone would never make one man attack another bitterly.