26 Voyage of the Wahlberg. [ZOE 
and rabbits, which would certainly destroy it in all places acces- 
sible to them. On San Benito, San Geronimo and Coronado 
Islands there are no goats to exterminate it. On Guadalupe 
they have already destroyed all within their reach, and on the 
islands off the coast of Alta California, like the sea-birds, it in- 
habits outlying rocks. But why is the genus not represented in 
the flora of San Martin, where conditions would seem to be suit- 
able for it ? 
San Roque is a very small, low island, perhaps a mile long, 
situated near the mainland, and about latitude 27° N. It is the 
home of quantities of sea-birds, and there is no vegetation upon 
it except a patch of Heliotropium Curassavicum. Asuncion Island, 
ten miles from San Roque and similarly situated, is a still smaller 
islet; its flora is only celia laciniata and an undetermined 
Lycium. 
From these islands the schooner went directly to San José del 
Cabo, a town situated at the extreme southern end of the Penin- 
sula. No stop was made at Magdalena or Santa Margarita 
Islands, to the disappointment of the botanists, but in reality 
nothing would have been gained, for later, on my return by 
steamer, I landed at Magdalena Bay and learned that there had 
been no rain for two or three years, and saw that even the peren- 
nials were leafless. 
Guadalupe has a more northern flora than any other of the 
Mexican islands, on account of its position with respect to the 
ocean currents and the prevalence of fogs; its springtime at the 
time of my visit was a month later than that of San Diego and 
the Todos Santos Islands, and far behind that of San Benito and 
Cedros. The wind often drifts fogs over the high northern head- 
lands of the large islands of Cedros and Guadalupe when the 
lower portions are warmed by the sun, and in consequence there 
is a difference between the floras of the two ends. The growth 
of pines, cypress and juniper at the north, and their absence 
from the south, are the most evident results of different con- 
- ditions. 
The Revillagigedo group were visited in 1889 by the U. S. 
Fish Commission vessel Albatross. At that time some plants 
