502 TRANS. OF THE ACAD. OF SCIENCE. 



position of Providence." The general course of the river 

 was noted as very crooked, with numerous sharp turns, the 

 river on every side being shut in by precipitous walls of 

 "white sand rock." These walls present a smooth, perpen- 

 dicular and, occasionally, over-hanging surface, extending up- 

 ward to a variable height, and showing a distinct line of high- 

 water mark thirty to forty feet above the then water-level. 



His estimate of the average height of the Canon was 3,000 

 feet, the upper edge of which flared ont about half way from 

 the bottom, thus presenting a rugged crest. The last two 

 days in the Canon, dark-colored igneous rocks took the place 

 of the " white sandstone," which finally showed distinct breaks 

 on either side, till he reached a more open country, contain- 

 ing small patches of bottom land, and inhabited by bands of 

 Indians. Here he succeeded in procuring a scanty supply of 

 Mezquite bread, barely sufficient to sustain life till he reached 

 Callville, on the 8th of September, just fourteen days from the 

 time of starting, during seven of which he had no food of any 

 description. 



When finally rescued, this man presented a pitiable object, 

 emaciated and haggard from abstinence, his bare feet literally 

 flayed from constant exposure to drenching water, aggravated 

 by occasional scorchings of a vertical sun; his Omental facul- 

 ties, though still sound, liable to wander, and verging close 

 on the brink of insanity. Being, however, of a naturally 

 strong constitution, he soon recovered his usual health, and is 

 now a stout, hearty, thick-set man. His narrative throughout 

 bears all the evidences of entire reliability, and is sustained by 

 collateral evidence, so that there is not the least reason to 

 doubt that he actually accomplished the jonrney in the man- 

 ner and in the time mentioned by him. 



CONCLUSIONS. 



The following may be summed up as some of the new facts 

 to be derived from this remarkable voyage, as additions to our 

 present geographical knowledge of the Hydrography of the 

 Colorado River: 



1st. The actual location of the mouth of the San Juan, 40 

 miles below Green River junction, and its entrance by a canon 

 continuous with that of the Colorado. 



2d. From the mouth of the San Juan to the Colorado Chi- 

 quito, three days' travel in the swiftest portion of the current, 

 allowing a rate of four miles per hour, for fifteen hours, or 

 sixty miles per day, would give an estimated distance of 180 

 miles, including the most inaccessible portion of the Great 

 Canon. 



3d. From Colorado Chiquito to Callville, ten days' travel 

 was expended. As this portion of the route was more open, 



