IV NOTE. 



« 



is situated the famous Comstock Lode, drawn to a scale of 1 inch to 500 feet, 

 will be published to the scale of 1 inch to 1,500 feet, making a map of the 

 size of four regular atlas sheets. 



The following Geological Maps, forming a part of those supplementing 

 Volume III, based upon the topographical sheets, have been published, 

 i. e., Title-Page, Index Sheet, Restored Outline of Lake Bonneville, Nos. 50, 

 59, £ of 58, and £ of 6fi, 67, 75, 76, and 83. Other sheets are in course of 

 completion. 



The Topographical Atlas referred to, embracing the entire area west 

 of the 100th meridian, will comprise 95 sheets, on a scale of 1 inch to 8 

 miles, numbered consecutively from 1 to 95, inclusive, while the "Geolog- 

 ical Atlas" will consist of the same number, using the topographical maps 

 as a base. (See Progress Map of 1878.) Upon a number of the topo- 

 graphical maps as a base, the classification of lands into the following divi- 

 sions, (1) Agricultural with irrigation, (2) Timber, (3) Grazing, (4) Arid 

 and Barren, is shown by colors. It is intended to expand this classifica- 

 tion to embrace the entire area, thus gathering data upon which a new legal 

 subdivision to settlers, to accord with presumable values as to class, may be 

 made, pursuant finally to the following divisions : 



. . , . ( without irrigation. 



1. Agricultural, < . . . . 



( with irrigation or drainage. 



n „. n (1. Large, ) with prevailing species, as Live Oak, 



2. Timber, 1 > 



( 2. Small, ) Cedar, etc. 



3. Grazing, } > with species and quality of grasses. 



^ a. Jjacl, ) 



4. Arid or barren, including "desert lands." 



5. Swamp and overflowed. 



6. Location of the precious and economic minerals, such as — 



