96 
tracking, two or three miles an hour might be made. Lerdo was 
reached on February 22, and at this point the sloop was put in 
the hands of a small party of Indians to be towed up the river a 
hundred miles to Yuma, while the outfit and collections were 
Fic. 16. Opuntia sp. with propagating branches on the ground near the base of the 
plant. Lycium Torrey? in background. Near San Felipe Bay, Baja California. 
placed in a wagon drawn by four horses and carried to Yuma, 
the members of the party accomplishing the distance of 72 miles, 
chiefly afoot, in two days. This gave further opportunity for 
