As soon as the Captain invalided I at once determined to leave the "Beagle", but it was quite absurd what a revolution in five minutes was effected in all my feelings. I have long been grieved and most sorry at the interminable length of the voyage (although I never would have quitted it); but the minute it was all over, I could not make up my mind to return. I could not give up all the geological castles in the air which I had been building up for the last two years. One whole night I tried to think over the pleasure of seeing Shrewsbury again, but the barren plains of Peru gained the day. I made the following scheme (I know you will abuse me, and perhaps if I had put it in execution, my father would have sent a mandamus after me); it was to examine the Cordilleras of Chili during this summer, and in winter go from port to port on the coast of Peru to Lima, returning this time next year to Valparaiso, cross the Cordilleras to Buenos Ayres, and take ship to England. Would not this have been a fine excursion, and in sixteen months I should have been with you all? To have endured Tierra del Fuego and not seen the Pacific would have been miserable... I go on board to-morrow; I have been for the last six weeks in Corfield's house. You cannot imagine what a kind friend I have found him. He is universally liked, and respected by the natives and foreigners. Several Chileno Signoritas are very obligingly anxious to become the signoras of this house. Tell my father I have kept my promise of being extravagant in Chili. I have drawn a bill of 100 pounds (had it not better be notified to Messrs. Robarts & Co.); 50 pounds goes to the Captain for the ensuing year, and 30 pounds I take to sea for the small ports; so that bona fide I have not spent 180 pounds during these last four months. I hope not to draw another bill for six months. All the foregoing particulars were only settled yesterday. It has done me more good than a pint of medicine, and I have not been so happy for the last year. If it had not been for my illness, these four months in Chili would have been very pleasant. I have had ill luck, however, in only one little earthquake having happened. I was lying in bed when there was a party at dinner in the house; on a sudden I heard such a hubbub in the dining-room; without a word being spoken, it was devil take the hindmost who should get out first; at the same moment I felt my bed SLIGHTLY vibrate in a lateral direction. The party were old stagers, and heard the noise which always precedes a shock; and no old stager looks at an earthquake with philosophical eyes... Good-bye to you all; you will not have another letter for some time. My dear Catherine, Yours affectionately, CHAS. DARWIN. My best love to my father, and all of you. Love to Nancy. CHARLES DARWIN TO MISS S. DARWIN. Valparaiso, April 23, 1835. My dear Susan,