101 
tent on a sand-dune between two sea-grape trees. From this 
point we traversed the plateau nearly to the lighthouse on the 
eastern side, and, at another time, Mr. Hess went by rowboat 
around the cliffs to the lighthouse itself, while the others of the 
a studied the talus. Several species of cacti were observed 
ona; they are mostly on the pie and locally aes plenty, 
the evening of February 26, and, after cruising eastward under 
light variable winds, we reached Mayaguez at 10 o'clock the fol- 
lowing evening, well satisfied with the results of our Mona 
Passage voyage, which yielded 313 field numbers of plants, 
among them over 500 lbs. of living cacti, and the first compre- 
hensive knowledge of the land invertebrates of Desecheo and of 
Mona 
Our next collecting base was Arecibo, on the north coast of 
Porto Rico, where we proceeded by rail on March 1, Mr. Hess 
remaining at Mayaguez. Collections were made on that day on 
low limestone hills near the lighthouse, where a desirable museum 
accession was made in the fruits of Hyperbaena, a vine of the 
msee amily m March 2, we went by carriages to 
Hatillo and Quebradillas, and studied coastal thickets and lime- 
stone hills and ravines; our special object was to see the small 
palm which here clothes the coastal cliffs. It is a beautiful ane 
the largest one observed, with a trunk only about 6 feet high, its 
leaves shining above, whitish beneath; we hoped to obtain its 
seeds for germination, but none could be had at this time of the 
year. With it grows a vine of the Morning-glory ee with 
bright red flowers, also desirable for cultivation. A small pond 
near Hatillo is beautified by a growth of Neptunia, aie ae 
yellow flowers in globose heads, its leaves sensitive to the touch; 
plenty of seeds of this unusual sensitive-plant were obtained. 
March 3 was given to work on the limestone hills at Hato Arriba, 
on the road toward Lares, where a rich flora was found and speci- 
mens of 70 species obtained, among them many beautiful ferns 
and mosses. Many orchids and bromeliads were here collected 
