4 PREFACE TO SERIES II. 
the drawings, and the same well-known firm continue to execute the 
Lithographic plates. The same assistance will be extended by numerous 
correspondents all over the United States; and with the increased love 
of the task which the success of the first venture brings to the author, he 
hopes to make this second “General View of the Native Flowers and 
Ferns of the United States,” at least as interesting as the first. 
Special acknowledgments of friendly aid will appear as the work pro- 
gresses; but more than this is due to Professor C. S. Sargent, of the 
Cambridge Botanic Garden, to Mr. Jackson Dawson, the gardener at 
the Arnold Arboretum of the Bussey Institute, and to Mr. John H. Red- 
field, the conservator of the Herbarium of the Academy of Natural 
Sciences of Philadelphia, for continuous and generous assistance on 
frequent occasions. 
THOMAS MEEHAN. 
GERMANTOWN, PHILADELPHIA, May, 1870. 
