Letter from [Alfred Daniel] Hall, Lawes Agricultural Trust, Rothamsted Experimental Station, Harpenden, to Robert [William Frederick] Harrison, The Royal Society, Burlington House, London 'Dear Mr Harrison, I enclose some of the curves in question and the others will be posted to you during the day. If the paper is passed for publication I will let you have these curves redrawn on white or Bristol boards. We should like the paper to appear in the Proceedings if passed. I am yours truly, A. D. Hall. Director'. 7 February 1906