INDEX. VH 



CHAPTER IV. 



Route near the thirty-fifth parallel of north latitude. 



Page. 



Considerations determining the general position of the route 74 



Description of the route, distances and elevations, tunnel in Cajon Pass, &c 74, 75 



Grades 75 



Soil 75,70 



Building material 76 



Fuel 



Water 77 



Elevations, sum of ascents and descents, lengths, &c - 77,78 



Estimated cost, with remarks 



CHAPTER V. 

 Route near tlie thirty-fifth parallel of north latitude. 



I. From Red river to the Rio Grande 79-81 



Examination of route in detail from Fulton to the Llano Estacado, (comprising topographical description, 



grades, building materials, fuel, water, &c.) 7!) 



Westward extension of fertile soil in this latitude 79 



Construction across the Llano Estacado, water, ties, lumber, fuel, &c 79, 80 



Construction from the Pecos river to the Rio Grande, and Guadalupe Pass, water, ties, lumber, fuel 80 



Building stone from Red river to Rio Grande 80,81 



Coal 81 



General characteristics of this portion of the route, and elevations 81 



Remarks upon the estimated cost of construction 81 



II. From the Rio Grande to the mouth of the Gila 81-86 



General description of the country between Dona Ana, on the Rio Grande, and the Pimas villages, on the Gila 



profile of the route, elevation, grades, &c 81, 82 



Use of steep natural grades 82 



Route along the Rio Grande 82 



Parke s grades , 82,83 



Water 83,84,85 



Fuel 85 



Peculiar features of the country favoring the cheap construction of a railroad 85 



Examination of the route in detail from the Pimas villages, along the Gila to the Colorado river 86 



III. From the mouth of the Gila to San Francisco 86-94 



Examination of the route in detail from the mouth of the Gila to the eastern entrance of the San Gorgonio 



Pass, passes of the coast range, Colorado desert, construction, water, soil, distances, grades 86 



San Gorgonio Pass natural grades 87 



Connection with San Diego ; with San Pedro ; their harbors 87 



Continuation of detailed examination of the route to San Francisco 87 



Passes through the coast range, by which the Great Basin may be attained from the plains of Los Angeles, and 



selection of the New Pass 87, 88 



Continuation of the route from San Gorgonio Pass to the Great Basin 88 



Passes from the Great Basin to the head of the Tulares Valley 88,89 



Superiority of the Tah-ee-chay-pah Pass 89 



Continuation of the route in the Great Basin, and to the Tulares Valley 89 



Continuation of the route along the Tulares and San Joaquin Valleys, to the Straits of Martinez 89, 90 



More direct route to San Francisco by the San Jose Valley 90 



Soil, building materials, fuel, water, sum of ascents and descents, lengths, &c 90 



Characteristic features of this portion of the route, the mountain passes and their character; use of steep 



grades 90,91 



Extract from the report of Allan Campbell, esq., chief engineer of the Valparaiso and Santiago railroad, in 



which the subject of steep grades is discussed 91-94 



Application of this discussion to the natural grades in the mountain passes of this route near the thirty-second 



parallel 94 



Snow and ice on the Tah-ee-chay-pah Pass, and on the route generally 94 



General review of the whole route 94-99 



General considerations which determine the position of the route ; its characteristics ; elevations of its mountain 



passes, and general elevation ; peculiar features of the arid plains favorable to cheap construction of road ; 



water, and cost of carrying it 94,95 



