PREFACE 
Of the papers presented at the celebration of the Semi-cen- 
tennial Anniversary of the Torrey Botanical Club, one, “Тһе 
ferns of tropical Florida" by John K. Small, has already been 
published elsewhere (Am. Mus. Jour. 18: 126-134. 1918); an- 
other, on “ Bermuda Algae" by Marshall A. Howe, was, in sub- 
stance, an illustrated summary of a contribution to Britton's 
“Біога of Bermuda," recently published, and is not here repro- 
duced; іп a somewhat similar way, the paper on the “Flora of the 
Rocky Mountains and adjacent plains" by P. A. Rydberg was 
in considerable part a summary of the principal results attained 
in the author's book of that title, then issuing from the press. 
A few other papers actually presented or read by title are omitted 
either because copy failed to reach the editor in season or because 
arrangements had been made for publication elsewhere. Such 
papers include “Fossil plants from Porto Rico” by Arthur Hollick, 
““ A cotton-rust epidemic in Texas" by E. W. Olive, “ The flora of 
the Isle of Pines, Cuba," by N. L. Britton and Percy Wilson, 
“The route taken by Capt. Nathaniel J. Wyeth and Mr. Thomas 
Nuttall from the Mississippi River to the Columbia River in 1843” 
by W. W. Eggleston, “Comparative cultures of seed-plants in 
desert valley, desert mountain, and coastal locations" by D. T. 
MacDougal, "The Vegetation of Montauk, Long Island" by 
Norman Taylor, and "Parthenocarpy in cucumbers” by A. F: 
- Blakeslee and P. A. Warren. 
MARSHALL А. HOWE, 
Editor 
