LETTER OF THE GEOLOGIST. XXIX 



Where material is immediately at hand, as is usually the case, a mon- 

 ument five to six feet high can be erected in half an hour by two men. 



Our experience has been that the erection of these monuments re- 

 quires no additional force, and but a trifling amount of time, and hence 

 need involve no extra expense whatever. 



On our final maps, those stations on which monuments have been 

 erected will be appropriately marked, and their correct positions, in lati- 

 tude and longitude, will be given. 



The public-land surveys, by use of these monuments, will be enabled 

 to effect a great saving in running base-lines and guide-meridians over 

 difficult mountain country. Also, the large errors, which such lines are 

 almost sure to involve, are avoided. 



A more detailed account of the publications of the survey and the 

 office work will be given in the annual report for 1877, which will go to 

 press in October. 



With the hope that this report will prove of value to the government 

 and to science it is respectfully submitted. 



I have the honor to be your obedient servant, 



^ F. V. HAYDE:tf, 



United States Geologist. 



To Hon. Carl Schurz, 



Secretary of the Interior. 



