REPORT OF THE SECRETARY, 



G9 



Similar iuforinatioa respecting the geograpUic work doue in the fol- 

 lowing year, ending June 30, 1880, will be found in the subjoined table: 



Mas.sacluisel ts 



New Jersey 



Southern Appalacliiaii region 



Missouri-Kansas 



Texas 



Arizona 



Gold Belt, California 



Northern California and Southern Oregon 



Yellowstone National Park and Northwestern Wy- 

 oniinir 



Scale of pub- 

 lication. 



Total 



G'2500 



()-,>500 



125000 



125000 



125000 



250000 



125000 



250000 



1 : 125000 



Contour 

 interval. 



Area. 



Feet. 

 20 

 20 

 100 



50 



50 



200 



100 



200 



100 



Sq. VI. 



2, 500 



1,84:5 



2:5, {J8G 



21,400 



8,000 



H, 000 



2,400 



10, 400 



3,000 



81,829 



The average cost of the work during the year was approximately 

 $2.75 per square mile. 



Under the Division of Geographj^ the work in the northeastern sec- 

 tion is divided into two sub- sections, uamely, those of Massachusetts 

 and New Jersey. In the former the work is carried on at the joint ex- 

 pense of the State of Massachusetts and the United States. In this 

 State the entire area reported for the two years during which work has 

 been going on, amounts to 3,750 square miles, or nearly one-half the 

 area of the State. 



Work in the IsTew Jersey sub-section was, as heretofore, under the 

 general supervision of Prof. George H. Cook, State geologist. The 

 work has been continued on the basis indicated in the hist report, and 

 an area of 3,111 square miles has been comph'tely surveyed in the past 

 two years, while a considerable amount of preliminary work has been 

 done on other portions of the State. At the present time nearly all 

 the area of the State has been completed. 



Aijpalachian Section. — The intricacy of geologic phenomena in this 

 region has led to the adoption of a larger scale for the maps than that 

 which has been used in other cases; as the country is perhaps the most 

 difQcult for the surveyor to be found upon the continent, the rate and 

 cost of work will not bear favorable comparison with other less difficult 

 areas. However, notwithstanding these drawbacks , the large force con- 

 centrated on the area has enabled the geographer in charge of it, Mr. 

 Gilbert Thompson, to complete 41,320 square miles in the two years 

 under consideration. 



^Yestcrn Section. — During the year ending June 30, 1885, work was 

 prosecuted in the Missouri Kansas, Texas, and Arizona sub-sections, 

 and in the following year, to this section were added the Gold Belt 

 and Cascade sub-sections. It was found that in those States which had 



