wilson etal.] MARYLAND. 81 
MARYLAND. 
ERRATA IN PREVIOUS REPORTS. 
Elevations in the vicinity of Baltimore published in preceding- 
reports are corrected by various amounts by a readjustment with 
work of the past two seasons. (Full description, with corrected list 
ol* elevations, will be found in this report.) 
The following corrections to the Twenty-first Annual Report are 
made necessary by the latest adjustment of the United States Coast 
and Geodetic Survey: 
Foot. 
Page 445: Elevation at Cumberland —0.006 
Page 446: List of elevations in vicinity of, depending on Great Cacapon, 
though referred to Cumberland _. —.070 
HARFORD AND BALTIMORE COUNTIES. 
Belair, Havre de Grace, and Parkton Quadrangles. 
The elevations published in the following list are the result of the 
field work of the seasons of 1899-1900, and are based on an aluminum 
tablet in the city hall, Baltimore, Md., the height of which is accepted 
as 20.(530 feet above mean sea level, as derived from the United States 
Coast and Geodetic Survey tide gauge in the city of Baltimore. 
The leveling was done under the direction of Mr. W. Carvel Hall, 
topographer, by Messrs. C. H. Smith, John W. Hodges, and Hargraves 
Wood, levelmen. 
All bench marks dependent on tins datum are marked with the 
letters "BALTO.," referring them to the Baltimore bench mark. 
SCARBORO, VIA FOUNTAIN GREEN. TO CARSINS. 
Feet. 
Allibone, 1 mile north of: on nail in root of oak tree, at south end of iron 
bridge over Deer Creek, marked "174" on tree 176. 66 
Allibone, 0.5 mile north of; aluminum tablet set in southeast corner 
Mrs. Webster's spring house, 3 feet above ground, marked " BALTO. 
209" 211.099 
Gibson. 0.25 mile north of; on nail in root of poplar tree on brow of hill 
at east side of road, marked " 460 " on tree. _ . 467. 81 
Hickory; on nail in root of locust tree, about 30 feet west of post-office 
on same side of road, marked "477 " on tree 479. 22 
Fountain Green, 1 mile north of; on top of rock at northwest corner 
intersection with road southwest and northeast, marked "290" on 
rock 292.59 
Belair; aluminum tablet set in steps of Belair court-house, marked 
"BALTO.394" 395.650 
Fountain Green; on nail in root of sycamore tree at northwest corner 
of crossroads, opposite post-office, marked "340" on tree 341. 99 
Fountain Green, 0.5 mile east of; on nail in root of oak tree standing 
with a clump of three large oaks at north side of road opposite the 
Woman's Christian Temperance Union Hall, marked "416 " on tree.. 417. 86 
Bull. 185—01 (5 
