Sept. 26, 1907 Dr. L. H. Pammel, Botanical Dept., Ames, Iowa. My dear Dr. Pammel: I beg to acknowledge the receipt of your favor and also of the enclosures under separate cover which I consider very valuable contributions. I am still analyzing water and finding it very interesting. I shall await Prof. Buchanans answer with interest. Again, thanking you for your kindness and with best wishes to all, I am, Yours very truly, Geo. W. Carver Dict. To E.A.C.