. Report of the geological exploration of the fortieth parallel . the work, for the constant use of his library and theprocurement of needed books of reference, and for assistance of every kindrendered in innumerable instances, always most kindly and generously. Byhim also the Composites of the, collection, comprising of one-seventh of thewhole, were carefully determined and the resulting paper forms one of the mostvaluable portions of the Catalogue. Assistance in various portions of thework has likewise been received from Dr. Gray and Dr. Torrey, in additionto the free use of their herbariums
. Report of the geological exploration of the fortieth parallel . the work, for the constant use of his library and theprocurement of needed books of reference, and for assistance of every kindrendered in innumerable instances, always most kindly and generously. Byhim also the Composites of the, collection, comprising of one-seventh of thewhole, were carefully determined and the resulting paper forms one of the mostvaluable portions of the Catalogue. Assistance in various portions of thework has likewise been received from Dr. Gray and Dr. Torrey, in additionto the free use of their herbariums whenever desired. Dr. George Exgel-mann, also, of St. Louis, has made ready response to every application forinformation and aid, and the articles of Col. Olney on the Carices, of on the Mosses, of Dr. Robbins on Potamogeton, and of Prof. Tucker-man on the Lichens, all prompt and thorough in whatever they have under-taken, show that the most that was possible has been made by them of thematerial that was furnished. SEREXO WATSON. August 26, 1871. viiireportofgeologic05unit. 61
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