The catalogue follows Gray's Manual in the classifica- 

 tion of the Phanerogams ; the following exceptions to the 

 order of the Manual are to be noted : species of Cyperus 

 are arranged according to Dr. Britton's " A Preliminary 

 liist of North American Species of Cyperus, with Descrip- 

 tions of New Forms." Bull. Torr. Bot. Club, Vol. XIII. , 

 No. n. ; species of Carex following Prof. Bailey's "A 

 Preliminary Synopsis of North American Carices," etc., 

 contributed April 14, 1886 to the Proceedings of the 

 Amer. Acad, of Arts and Sciences ; genera of Grasses 

 after Bentham and Hooker's Genera Plantarum. 



The Cryptogams follow the arrangement suggested in 

 Gray's "Lessons in Botany," revised edition, 1887. 

 The nomenclature follows Gray in the North Am. Flora, 

 the Revision of the Ranunculaceee, and of Violacese ; 

 Coulter in the Umbelliferse ; Watson's Index elsewhere 

 in the Polypetalse ; and Morong in the Typhacese. In the 

 Cryptogams, the catalogue adopts the classification of 

 Engelmann on Isoetes, James and Lesquereux on Mosses, 

 and Farlow on marine Algse. 



Many botanists have kindly contributed their services. 

 Dr. Gray determined the doubtful species of Composite, 

 more especially the Golden Rods and Asters. Dr. Sereno 

 Watson has given advice and information, and afforded 

 special facilities for work at the Gray Herbarium. Dr. 

 W. G. Farlow has rendered assistance in the Characese and 

 fresh water Algse. Mr. M. S. Bebb has gone over speci- 

 mens of our county willows, and contributed notes upon 

 several species. Rev. Thos. Morong has furnished 

 notes upon the Naiadacese, and a set of Potamogetons for 

 the county herbarium. Miss Clara E. Cummings has 

 revised the list of Mosses and Lichens, and Mr. Geo. E. 

 Davenport the ferns. Dr. D. F. Lincoln has given an 

 account of the geological characteristics of the soil. 



