158 General Notes. 
which forms the watershed between the rivers flowing into the Chi- 
nese sea and the Meinam Kong (Mekong), has peaks of 9,000 feet. 
Another range, which leaves the western range near Chingmai 
(Zimmé), forms the watershed between the Meinam and Meinam 
Kong valleys. Famous salt wells exist in this range at the source 
of the eastern branch of the Meinam. 
Arrica.—M. Dours? ADVENTURES IN THE SAHARA.—M. 
Douls, disguised as a Mussulman, landed from a Canary Island fish- 
ing boat at a point between Cape Bojadorand the Rio de Oro. The 
first Moors he met suspected him, and made him a prisoner, but by 
persevering in his rôle he was finally admitted:as a brother into the 
tribe, which proved to be a section of the terrible Ulad Delim, the 
robbers of the Western Sahara. For five months he wandered with 
them, exploring the desert of Uaran and Djuf, the great depression 
of the Sahara. In March last he was at Tendaf, the great slave 
market of the Northern Sahara. This oasis has greatly increased 
in size since Dr. Lenz’s visit in 1880. Taking leave of the nomads 
at Glimin, he proceeded across the Atlas through the country of the 
Berbers of Sus to the city of Morocco. Here he was suspected and 
thrown into a dungeon, but was fortunately liberated through the 
representations of Sir Kirby Green, the English ambassador, who 
reached the town the same evening. 
AMERICA.—SUBMARINE V ALLEYS OF THE CALIFORNIAN COAST. 
—Prof. Geo. Davidson (Bull. Cal. Acad. Sci.) describes the subma- 
rine valleys discovered off the Pacific Coast of the United States. 
Within forty or fifty miles of the shore south of Cape Mendocino the 
lateau of the Pacific reaches a depth of 2,000 to 2,400 fathoms. 
here is usually a marginal plateau ten miles wide to the 100 fathom 
curve, beyond which the descent is sharp to 500 or 600 fathoms. 
In this marginal plateau several remarkable valleys have been dis- 
covered. One of these is in Monterey Bay, heading to the lowlands 
at the bend of Salinas river; and another off Point Hueneme, at 
