contemplate as large a scale as six miles to an inch for the general map 

 of the State; but this would require nine sheets, and seems too extensive 

 an undertaking for our means, or for any means that we are ever likely 

 to be supplied with; and the publication on that scale of the Central 

 California Map, which embraces only one third of the area of the State, 

 but ninety-five per cent, of its population, will render it less necessary 

 to use so large a scale for the very thinly inhabited region of the 

 extreme north and south. 



To pass to the statement of what is accomplished in collecting the 

 materials and putting them on paper, in accordance with the above plan, 

 the following is subniitted : 



(a) Scale of a mile to two inches. On this scale a map of the vicinity 

 of Monte Diablo has been completed, and is now ready for the engraver. 

 It is two and a half by three feet in size, and embraces the most ' 

 important coal deposits yet discovered in the State. It covers an area of 

 one hundred and seventy square miles.' The Map of the Yosemite Valley, 

 made by Mr. Gardner, and engraved for the Yosemite Book, is also on 

 this^cale. It is fifteen inches by twenty-four in size. 



(b) Scale of two miles to one inch. On this scale the "Map of the vicin-^ 

 ity of the Bay of San Francisco" has been drawn and engraved. This 

 map covers an area of four thousand two hundred and forty-eight square 

 miles of land, just about equal to that of the State of Connecticut. It is 

 four feet by three in size, and has been engraved on two sheets. It 

 embraces the whole of San Francisco, San Mateo, Contra Costa, Ala- 

 meda, and : Marin Counttes, a large portion of Santa Cruz and Santa 

 Clara, and a part of Solano, Sonoma, and Napa. This is the most 

 densely settled portion of the State, containing as it does the heart of 

 the agricultural and commercial region. Over one third of the popula 

 tion of California reside within its borders. This map has been engraved 

 in New York, and copies of it are expected by the next steamer. Much 

 delay in issuing it has been caused by the necessity of sending proof 

 sheets back and forth from San Francisco to New York, and also by the 

 numerous change^ which have been made in the boundaries of ranches 

 during the past two years. 



On the same scale as the Bay Map, three maps of the central counties 

 of the State along the Sierra Nevada, and including the principal mining 

 region of the State, are projected. Of these, the northern one embraces 

 Plunlas and Sierra, and parts of Yuba and \Butte Counties; the central, 

 Nevada, Placer, El Dorado, Amador, and Calaveras, and portions of 

 Yuba, Butte, Sutter, Sacramento, and San Joaquin; the southern, part 

 of Calaveras, all of Tuolumne and Mariposa, and parts of Stanislaus, 

 Merced, and Fresno Counties. Of these, the fieldwork for Plumas -and 

 Sierra is nearly completed, and the map can be drawn whenever the 

 state of our funds permits it. The Central County Map is commenced, 

 and the fieldwork about one third completed ; that of the southern 

 counties is also about one third completed. These maps are intended to 

 show the minute details of the topography; the position of all towns, 

 villages, mining camps, and ranches; the roads, mines, mills, and ditches; 

 and, in short, to answer all the requirements of the different counties 

 for geographical purposes. 



On the same scal$ as the Bay Map is also drawn the " Map of a por 

 tion of the Sierra Nevada adjacent to the Yosemite." This is thirty 

 inches by twenty in size, embracing between two and three thousand 



