Later on in the summer the scheme took more definite form, and the date seems to have been fixed for June, 1832. He got information in London about passage-money, and in July was working at Spanish and calling Fox "un grandisimo lebron," in proof of his knowledge of the language; which, however, he found "intensely stupid." But even then he seems to have had some doubts about his companions' zeal, for he writes to Henslow (July 27, 1831): "I hope you continue to fan your Canary ardour. I read and re-read Humboldt; do you do the same? I am sure nothing will prevent us seeing the Great Dragon Tree." Geological work and Teneriffe dreams carried him through the summer, till on returning from Barmouth for the sacred 1st of September, he received the offer of appointment as Naturalist to the "Beagle". The following extract from the pocket-book will be a help in reading the letters:-- "Returned to Shrewsbury at end of August. Refused offer of voyage. "September.--Went to Maer, returned with Uncle Jos. to Shrewsbury, thence to Cambridge. London. "11th.--Went with Captain Fitz-Roy in steamer to Plymouth to see the "Beagle". "22nd.--Returned to Shrewsbury, passing through Cambridge. "October 2nd.--Took leave of my home. Stayed in London. "24th--Reached Plymouth. "October and November.--These months very miserable. "December 10th.--Sailed, but were obliged to put back. "21st.--Put to sea again, and were driven back. "27th.--Sailed from England on our Circumnavigation." GEORGE PEACOCK (Formerly Dean of Ely, and Lowndean Professor of Astronomy at Cambridge.) TO J.S. HENSLOW. 7 Suffolk Street, Pall Mall East. [1831.] My dear Henslow, Captain Fitz-Roy is going out to survey the southern coast of Tierra del Fuego, and afterwards to visit many of the South Sea Islands, and to return by the Indian Archipelago. The vessel is fitted out expressly for scientific purposes, combined with the survey; it will furnish, therefore, a rare opportunity for a naturalist, and it would be a great misfortune that it should be lost. An offer has been made to me to recommend a proper person to go out as a naturalist with this expedition; he will be treated with every consideration. The Captain is a young man of very pleasing manners (a nephew of the Duke of Grafton), of great zeal in his profession, and who is very highly spoken of; if Leonard Jenyns could go, what treasures he might bring home with him, as the ship would be placed at his disposal whenever his inquiries made it necessary or desirable. In the absence of so accomplished a naturalist, is there any person whom you could strongly recommend? he must be such a person as would do credit to our recommendation. Do think of this subject, it would be a serious loss to the cause of natural science if this fine opportunity was lost.... The ship sails about the end of September. Write immediately, and tell me what can be done. Believe me, My dear Henslow, Most truly yours, GEORGE PEACOCK.