Apparently make no watercourses unnecessary, saw no game or large birds. Reached San Luis about 11 P.M. (6) In the morning got up about 9 AM near Chacabuco station in the province of Buenos Ayres. Yesterday toward event- ing Chacabuco the deserts changed somewhat, the mesquite green gave place to a larger field land dark green acacia which grew higher & more abundant so that a person walking on the plain was quite hidden & a horseman would be difficult to see. In the morning however we were in very different country in a grass region where rain fall is abundant & irrigation not needed. The plains were well stocked with cattle which stood in herds in shallow ponds or else about dry pond beds. The country was verdant with grass & new corn & it was hot & appressive. Many herds of small ostriches or rheas were seen wild on the plains where they are