£ 7 ] 136 



From August 18th up to the 14th October, all the collections 

 •were made in New Mexico, in the valley of the Del Norte, or on 

 the table lands adjacent, and between Santa Fe and the 33d par- 

 allel of latitude, (230 miles below Santa Fe.) 



From the 14th October to the 19th, we were crossing the great 

 dividing ridge between the waters of the Del Norte and the waters 

 of the Gila, nearly on the 33d parallel of north latitude, and be- 

 tween the 107th and 109th meridians of longitude, measured from 

 Greenwich. The greatest height of this dividing ridge along our 

 trail w?s about 6,000 feet above the sea. 



From the 19th of October to the 22d November, we were follow- 

 ing the course of the Gila river, occasionally forced into the moun- 

 tains to avoid the canons. This route is never far from the 33d 

 parallel of latitude, and is embraced between the 109° and 114° 30' 

 meridians of longitude, falling, during that distance, very uniformly 

 from about 5,000 feet to near the level of the sea. 



From the 22d November to the 24th, we were on the Colorado of 

 the west, traversing a low sandy bottom. 



From the 24th November to the 28th, we were crossing the great 

 desert of drifting sand, in a course little north of west. 



On the 28th November, we encamped at the Cariso (Reed) creek 

 or spring, the waters of which, when first exposed, are warm, and 

 emit the smell of sulphuretted hydrogen. 



From the 28th November, we commenced to ascend the Cordil- 

 leras of California, (the continuation of which forms the peninsula 

 of Lower California,) and reached the highest point of the route 

 December 5th, 3,000 feet above the sea, and as many below the 

 overhanging peaks. From that point we descended to San Diego, 

 a seaport on the level of the sea, in latitude 32° 45' and longitude 

 170 Q 11' west of Greenwich. This point we reached December 12. 



With great respect, very truly yours, 



5 W. H. EMORY. 



Professor Torrey, Princeton. 



