320 Wisconsin Academy of Sciences, Arts, and Letters. 
assavicum, Scaevola Plumieri, Sesuvium Portulacastrum, and 
Vallesia glabra. The low sandy area back of the beach is cov¬ 
ered in some places with a heavy growth of Sporobolns virgini- 
cus, while in other places, where the sand is encrusted with salt, 
Ipomoea Pes-caprae grows very abundantly and of great length, 
individual plants sometimes being fully one hundred feet long. 
Cyperus laevigatus is very common around the pools of brackish 
water, which have a strong odor of Sulphurated Hydrogen. 
Bordering this sandy area are low dense groves of Avicennia offi¬ 
cinalis, Hippomane Mancinella, and Laguncularia racemosa. 
There are several other low areas and ravines in the vicinity of 
the shore, above high tide mark, which are filled with thickets 
of Discaria pauciflora, and Parkinsonia aculeata. The remainder 
of the lower part of the island at this place is covered with 
bushes, Bursera trees, and cactus. Cereus sclerocarpus occurs 
commonly in the vicinity of the shore but was not seen above an 
elevation of 100 ft. Opuntia myriacantha, on the other hand, 
occurs abundantly on the lower parts, and to a considerable ex¬ 
tent to about 500 ft. At an elevation of 600 ft., however, it is 
scarce, and much smaller than lower down. The specimens seen 
at this elevation, were of about the same size as those which oc¬ 
cur at an elevation of 350 ft. at Academy Bay a few miles west 
of here. The Bursera trees are larger and more abundant above 
an elevation of 350 ft. than they are lower down. They are 
usually heavily covered with fruticose lichens. Piscidia Ery- 
thrina is another common forest tree in this region. 
There is a very noticeable decrease in the number of many 
of the forms common on the lower parts, between 350 and 450 
ft. elevation. Some of the species disappear here among which 
are: Croton Scouleri, Discaria pauciflora, Maytenus obovata, 
and Telanthera echinocephala. A few stunted specimen of Cheil- 
anthes microphylla were found in the lava crevices at an eleva¬ 
tion of 350 ft., and were the first ferns ever collected on this 
island. 
There are fewer trees in the region of the craters, at 400 ft., 
elevation, than lower down, and the country is covered with 
Lantana bushes four to five feet high with a few trees scattered 
through them. The sides of the craters are covered with low 
bushes of Euphorbia viminea, and other species, while at the 
top there are bushes, ferns, and grasses. The country to the 
north of these craters, is heavily forested with Bursera and 
