10 



square miles of one of the roughest and most picturesque regions of 

 the State. It extends from Mariposa and Big Oak Flat on the west, to 

 the head of the San Joaquin and Mono Lake on the east, it is the first 

 accurate map of any high mountain region ever prepared in the United 

 States. This map is now drawn, and in the hands of the engravers. It 

 is intended to accompany the Yosemite Book. 



A large amount of material in Kern, Tulare, Inyo, Alpine, and Mono 

 Counties has been plotted on this scale, not necessarily for publication, 

 but for use in compiling the general map of the State. 



(c) Scale of six miles to one inch. This is the scale adopted for the 

 Central California Map, which embraces the region from Owen's Lake 

 north to Lassen's Peak, and from Clear Lake east to the meridian, which 

 passes a little east of Owen's Lake and a few miles west of Austin, 

 Nevada. It is embraced between the parallels of 36 and 40 30' and 

 the meridians of 117 30' and 123. It is in four sheets, each twenty- 

 four inches square, and covers an area of about eighty thousand square 

 miles, of which, however, owing to the peculiar shape of the eastern 

 boundary of California, a portion is within the State of Nevada about 

 eighteen thousand square miles. About one third of the area of Califor 

 nia is embraced in this map, and as before remarked, fully ninety-five 

 per cent, of its population, according to the last census. The four sheets 

 are intended to be put together for use as a wall map, which will be 

 about four feet square. Of this Central California Map, the southwest 

 quarter, embracing the region of the coast range from about twenty 

 miles south of Monterey to Santa Kosa, and a portion of the Sierra 

 Nevada in Calaveras and Amador Counties, is drawn and ready for the 

 engraver. The southeast quarter is also partly drawn, and the field 

 work is entirely completed, with the exception of a small section east of 

 Owen's Lake, which is not accessible without an escort. This sheet, 

 however, will be completed so as to be ready for the engraver in the 

 spring, making half the map done. Of the remaining haft', the eastern 

 quarter is nearly finished as to fieldwork, say four fifths completed, 

 while the western quarter is about half done. With two parties in the 

 field next season, this map can be completed and drawn, ready for publi 

 cation, in about two years. This, the largest inland work of topography 

 yet undertake^ in the United States, as it aims to give the topography 

 as accurately and as much in detail as it can be shown on the scale 

 adopted, of eighty thousand square miles of country, a large part of 

 which is very mountainous, including the highest and roughest eleva 

 tions in the country, and probably on the North American Continent. 

 The Nevada portion of the map will be filled in from various sources, 

 among which may be particularly mentioned the Central Pacific Kail- 

 road surveys, and the work carried on in eighteen hundred and sixty- 

 seven by the United States, both under the authority of the War arid of 

 the Interior Departments. Enough has been done this year in Nevada 

 to give a very good idea of the topography of the western and central 

 portion of the State, and to make the worthlessness of the maps com 

 piled from the previously obtained data appear perfectly evident. To 

 form an idea of the size of California and the magnitude of our work, it 

 should be remembered that the area embraced on our Central Map is 

 twice that of Ohio, one of the largest States east of the Mississippi. 



On the same scale of six miles to an inch, we commenced at an early 

 period in the survey a map of the coast ranges south of the Bay of 

 Monterey, and extending to Santa Barbara. It is three feet by two and 

 a half in dimensions, and embraces about sixteen thousand square miles 



