AMERICAN 
JOURNAL OF SCIENCE AND ARTS, 
[THIRD SERIES] 
Art. XLIL—Recent Geographical work in the United States. 
A. Reporr or THE Corrs or Enerneers, U. 8. Army. 
repair of the national fortifications, to devise and carry forw 
; S. Lake Survey.—The survey of the Great Inte- 
tior Lakes, now under the direction of Major C. B. Comstoc 
U.S. Eng., has been in progress during the past year in Lakes 
Superior, Michigan, St. Clair and Champlain, and on the St. 
rence river. 
“In Lake Superior th f the Apostle Islands has been 
uperior the survey of the Apo - ot hea Por. 
ut 
Phas miles ; the base line at Minnesota Point has been measured ; 
the longitude of Duluth and St. Paul determined by telegraphic 
connection with Detroit; and longitude, latitude, and azimuth ob- 
‘vations have been made at several primary stations in the west 
end of the lake, 
Am, Jour. cNe Series, Vor. III, No. 17.—Mar, 1872. 
