I am very much obliged for the capital little Almanack; it so happened that I was wishing for one to keep in my portfolio. I had never seen this kind before, and shall certainly get one for the future. I think it is very amusing to have a list before one's eyes of the order of appearance of the plants and animals around one; it gives a fresh interest to each fine day. There is one point I should like to see a little improved, viz., the correction for the clock at shorter intervals. Most people, I suspect, who like myself have dials, will wish to be more precise than with a margin of three minutes. I always buy a shilling almanack for this SOLE end. By the way, YOURS, i.e., Van Voorst's Almanack, is very dear; it ought, at least, to be advertised post-free for the shilling. Do you not think a table (not rules) of conversion of French into English measures, and perhaps weights, would be exceedingly useful; also centigrade into Fahrenheit,--magnifying powers according to focal distances?--in fact you might make it the more useful publication of the age. I know what I should like best of all, namely, current meteorological remarks for each month, with statement of average course of winds and prediction of weather, in accordance with movements of barometer. People, I think, are always amused at knowing the extremes and means of temperature for corresponding times in other years. I hope you will go on with it another year. With many thanks, my dear Jenyns, Yours very truly, CHARLES DARWIN. CHARLES DARWIN TO J.D. HOOKER. Down, Sunday [April 18th, 1847]. My dear Hooker,