Geographical Notices. a 93 
and serpentine rock. The elevation of the summit was 
found to be 1,556 feet sticks the sea. It is proposed to tunnel this 
pass for three- fourths of a mile, commencing at a point about 
200 feet below the summit. e examinations in the vicinity of 
San Luis ra having been completed, the region lying be- 
tween the ocean, the plains of Los Angeles, the western edge of 
the Great ey and the heads of the Tulare and Salinas valleys 
was thoroughly explored. The line adopted as most favorable 
commen t the Arroyo Grande; traverses the» Gaudalupe 
Lar. ‘ asoents the Todos Santos summit: descends to the Rio 
de Alamos; crosses the =. between Rio de Tres Alamos 
Gaviote creek to San Buenaventura, the route is near the shore. 
It then follows the Semi plain and pass to the San Fernando 
are separated i a narrow valle 
“The examinations of the coast route having been completed, 
the Mojave river and basin were explored and found to have no 
connexion with the Colorado river and basin. 
“Proceeding to the Pimas villages, the initial — of the 
last reconnaissance, a division of the party was made; one half 
poets via Tucson, San Xavier, and the Cupiaye: de los 
imas, to the river San Pedro, and the other up the Gila. and 
San Pedro Se In his report of 1854, Lieutenant Parke 
suggested th “he bability of finding a feasible route from Valle 
del Sauz to Gila alle by a between the Chirica- 
ui mountains and Mount and ee thence in a 
northwesterl ‘direction xloary = the ‘westérti — — ount _ 
th ery a suits : a 5 for its etna 
oat ing the San Ped: eee miles from the 
P Giken eo on ei ap bank to the 
newly machen stream was called. ‘The springs mentioned by Bs 
Nugent, in his notes of Hay’s trip, were found in the _ ae 
Tos Pimas, and a reconnaissance was made of Nugent's ae a 
