80 
elevation of 1500 feet is reached. Up to this point the hills show fre- 
quent breaks in the continuity of their cover, and large groups of 
Opuntia littoralis are common, as well as the less conspicuous eylindro- 
puntia, O. prolifera. Above 1500 feet the chaparral is practically un- 
broken, and the number of species growing with Adenostoma is in- 
creased by the addition of Rhus ovata, Quercus dwmosa, Ceanothus tom- 
entosus and C, eglandulosus, Arctostaphylos tomentosa (manzanita), 
and Cneoridium dumosum. The monotony of this assemblage is re- 
heved here and there by individuals of Yucca whipplet, or by the oe- 
currence of Adenostoma sparsifolium, which is taller than its common 
congener and is particularly conspicuous when densely loaded with 
its small white flowers. 
A stop was made to examine the small colony of Tecate Cypress, a 
tree which appears to be endemic to this locality, although closely re- 
lated to Cupressus goveniana, After having visited on the previous day 
the only mainland station for Pinus torreyana, near La Jolla, it was 
very instructive to see another case In which plants of ancient lineage 
have been stranded and localized by the crustal movements of the Pa- 
cific coast me and by the climatic changes which have undoubtedly ae- 
compamied them. 
After reaching Campo we passed for more than 20 imiles through 
rolling country in which low granitic ridges alternate with alluvial val- 
leys. The ridges and lulls still bore chaparral, and the valleys were 
mostly in cultivation, although a few untouched ones sufficed to show 
that their original vegetation had been pure stands of Artemisia tri- 
dentata (sage-brush). On reaching the vicinity of Jacumba, 25 miles 
east of Campo, the complexion of the vegetation began to change very 
rapidly. Both species of Adcenostoma were left behind and the first in- 
dividuals of Covillea tridentata (erecsote bush) and Prosopis glandu- 
losa (mesquite) were seen. In short the chaparral had been passed and 
we were in what might be termed a ‘*bush desert’’. Many shrubs which 
had been infrequent for several miles now became more common, as 
Simmondsia californica (jojobe), Prunus dicifolia (desert plum), Jun- 
iperus californica (juniper) and Ephedra; while Quercus dumosa was 
replaced by @. furbinella. Representatives of the chaparral were 
still present in Audibertia polystachya, Cneordium dumosum and 
Arctostaphylos tomentosa, while the desert aspect of the landscape was 
heightened by numerous striking cacti and by the shrubs Atriplex, 
Lycium, and Krameria. 
The spot selected for our camp was doubly enjoyable by reason of 
the magnificent outlook over the desert below, and on account of the 
natural botanical garden by which we were surrounded. At an eleva- 
