'You I. INTRODUCTION. xiii 



and has read the proof sheets of the second. The Pteridophyte text was contributed to the 

 first edition by the late Professor Lucien M. Underwood, and to the second edition by Mr. 

 William R. Maxon. The text of the Grass Family has been written by Mr. George V. Nash 

 for both editions; many of the drawings of grasses made by Mr. Theodore Holm for the 

 first edition were supervised by Professor F. Lamson Scribner. The late Mr. Charles E. 

 Smith critically examined the final proof sheets of the first edition. Mr. Frederick V. 

 Coville has contributed the text of Juncaceae to both editions. The late Dr. Thomas Morong 

 wrote the text of several families for the first edition. The text of the Carrot Family in 

 both editions has been examined by Dr. J. N. Rose. Most of the drawings for the first 

 edition were supervised by Dr. Arthur Rollick. 



For the second edition Mr. Kenneth K. Mackenzie has contributed the text of Carex, 

 and supplied many specimens for study; Mr. W. W. Eggleston has written the text of 

 Crataegus; Dr. Ezra Brainerd has written the text of Viola; Dr. Per Axel Rydberg has 

 aided in the determination of specimens ; and many others have aided by specimens, notes 

 and information. 



Draughtsmen. 



Most of the drawings for the first edition were executed by Mr. F. Emil ; he made all 

 the figures of the Pteridophyta, Gymnospermae, and nearly all of the Monocotyledones, with 

 the exception of those of Gramineae, Melanthaceae, Liliaceae and Convallariaceae; also 

 nearly all of the apetalous Choripetalae, and a considerable portion of the Sympetalae. Miss 

 Millie Timmerman (now Mrs. Heinrich Ries) drew the bulk of the polypetalous Chori- 

 petalae, the enlarged parts being mostlv inserted by Dr. Arthur Hollick; she also did some 

 work on several of the sympetalous families. Mr. Joseph Bridgham drew the Melanthaceae, 

 Liliaceae and Convallariaceae; also the Ericaceae, Primulaceae and several related families. 

 Mr. Theodore Holm drew most of the Gramineae. Dr. Hollick has made some drawings 

 and numerous enlargements of special parts throughout the work. Miss Mary Knight and 

 Mr. Rudolph Weber have also contributed drawings. 



The additional drawings needed for the second edition, and some corrections of the 

 old ones, have been made by Mr. A. Mariolle, Miss Mary E. Eaton and Miss Rachel 

 Robinson. 



NEW YORK, 



April 15, 1913. 



