If you see Whewell, would you tell him the substance of this letter; or, if he will take the trouble, he may read it. My dear Henslow, I appeal to you in loco parentis. Pray tell me what you think? But do not judge me by the activity of mind which you and a few others possess, for in that case the more difficult things in hand the pleasanter the work; but, though I hope I never shall be idle, such is not the case with me. Ever, dear Henslow, Yours most truly, C. DARWIN. [He ultimately accepted the post, and held it for three years--from February 16, 1838, to February 19, 1841. After being assured of the Grant for the publication of the 'Zoology of the Voyage of the "Beagle",' there was much to be done in arranging the scheme of publication, and this occupied him during part of October and November.] CHARLES DARWIN TO J.S. HENSLOW. [4th November, 1837.] My dear Henslow, ...Pray tell Leonard (Rev. L. Jenyns.) that my Government work is going on smoothly, and I hope will be prosperous. He will see in the Prospectus his name attached to the fish; I set my shoulders to the work with a good heart. I am very much better than I was during the last month before my Shrewsbury visit. I fear the Geology will take me a great deal of time; I was looking over one set of notes, and the quantity I found I had to read, for that one place was frightful. If I live till I am eighty years old I shall not cease to marvel at finding myself an author; in the summer before I started, if any one had told me that I should have been an angel by this time, I should have thought it an equal impossibility. This marvellous transformation is all owing to you. I am sorry to find that a good many errata are left in the part of my volume, which is printed. During my absence Mr. Colburn employed some goose to revise, and he has multiplied, instead of diminishing my oversights; but for all that, the smooth paper and clear type has a charming appearance, and I sat the other evening gazing in silent admiration at the first page of my own volume, when I received it from the printers! Good-bye, my dear Henslow, C. DARWIN. 1838. [From the beginning of this year to nearly the end of June, he was busily employed on the zoological and geological results of his voyage. This spell of work was interrupted only by a visit of three days to Cambridge, in May; and even this short holiday was taken in consequence of failing health, as we may assume from the entry in his diary: "May 1st, unwell," and from a letter to his sister (May 16, 1838), when he wrote:-- "My trip of three days to Cambridge has done me such wonderful good, and filled my limbs with such elasticity, that I must get a little work out of my body before another holiday." This holiday seems to have been thoroughly enjoyed; he wrote to his sister:--