From J. D. Hooker   [1 March 1847]¹

Dear Darwin

I shall be with you on Wednesday Morning at 7 Park Street but doubt reaching you before 9’30, as I must be home on Tuesday evening & there is no Buss before 8$\frac{1}{2}$ from Kew; which would suit me well. I have an awful lot to talk about. What do you think of a Cape (exclusively) genus having turned up in Portugal. Granting mutation to your extent there ought to be reversions from aberrant forms or species to the original type or species: such occurring in distant localities would produce similar or identical species in said localities.—

All this will do better for a palaver. it is easier to me than migration. Your Gnats you know are my Camels & vice versa exactly.² Any man with an average conscience must feel himself desperately hemmed & hedged in when reasoning on such