102 SPIRIT LEVELING. [bull. 185. 
words " iron post, " in the second line of the introductory paragraph, 
substitute the words "copper bolt." Change the description on page 
470, seventh bench mark from top, to conform with introduction, 
omitting marked " PRTG 791." 
Page 470: Baraboo, at northeast corner of court-house; iron post, 
marked "PRTG 890," should read: Baraboo, at northeast corner of 
court-house; bronze tablet, marked "B 890," 896.760 feet. 
Note. — The latter is identical with bench mark described in intro- 
duction to list on page 468; therefore, to raise the elevations in the 
list on page 468 to the Portage datum add 7.079 feet. 
COLUMBIA, MARQUETTE, ADAMS, AND SAUK COUNTIES. 
Brigosville Quadrangle. 
The elevations in the following list are in continuation of those 
published in the Appendix to the Twenty-first Annual Report, page 
470, and are based upon a bench mark of the United States Lake Sur- 
vey, being a copper bolt 4 feet below ground and 25 feet from wall of 
lock of canal connecting Wisconsin and Fox rivers at Portage, Wis., 
and 84.6 feet above recess of upper gate of new lock. The elevation 
of this is accepted as 791.243 feet above mean sea level. 
The leveling was done under the direction of Mr. Robert Muldrow, 
topographer, by Mr. Robert Wipfler, levelman. 
All bench marks are referred to Portage and are stamped with the 
letters "PRTG" in addition to the figures of elevation. 
Feet. 
T. 12 N., R. 8 E., sec. 1, near \ corner, east side of; road crossing of 
Chicago, Milwaukee and St. Paul Railroad; top of rail. 827. 3 
T. 13 N., R. 8 E., sec. 21, near center of northwest \ of; at forks of road; 
iron post, marked "801 PRTG" 801.354 
T. 14 N., R. 8 E., sec. 33, at southwest corner of; at northeast corner of 
intersecting roads; iron post, marked " 813 PRTG " 812. 644 
T. 14 N., R. 7 E., sec. 33, near center of; north side of road; iron post, 
marked "941 PRTG". 941.205 
T. 13 N., R. 7E., sec. 6, near \ corner, west side of; east side of road; iron 
post, marked "1016 PRTG" 1,015.418 
T. 13 N., R. 7 E., sec 18, near southwest corner of; top of rail of Chicago, 
Milwaukee and St. Paul Railroad at wagon road crossing. 838. 65 
T. 12 N., R.8 E.. sec. 10, near center of; near forks of road; iron post, 
marked " 800 PRTG " 799.634 
T. 12 N., R. 7 E., sec. 11, about one-fourth mile east of northwest corner 
of; at intersection of roads; iron post, marked "929 PRTG ". 929. 543 
IOWA, GRANT, AND LAFAYETTE COUNTIES. 
Mineral Point Quadrangle. 
The elevations published in the following list are based on a bench 
mark of the Mississippi River Commission at Dubuque, Iowa, in the 
