SEAL TOWNSHIP WORKS. 15 
and Davis in this case are those of measurements. The lengths of the 
sides of the square, as shown by the notes of the Bureau survey, are 
854 feet east and west, and 852 north and south, being an average of 
53 feet greater than Messrs. Squier and Davis’s measurements. The 
work is, however, very nearly an exact square. 
According, to these authors the parallels running north to the circle 
are 100 feet apart and 475 feet long. According to the resurvey they 
are 68 feet apart, measuring to the middle line of each wall, and the 
average length 634 feet (the eastern 647, and western 621). The dis- 
tance from the square to the break of the ravine is 427 feet for the 
eastern side, and 400 for the western, the width of the ravine 110 feet. 
Some of the errors and inconsistencies we have pointed out may be 
considered of minor importance, yet when we take into consideration 
the large number of them, in the face of the repeated assertions of the 
authors that their surveys were accurately and carefully made, we are 
compelled to recognize that there has been an inexcusable degree of 
carelessness, which is calculated to depreciate their work, and to a great 
extent destroys confidence in their measurements and figures. 
Notwithstanding these criticisms, which, as will be seen, reijate 
almost wholly to measurements and to want of care in editing their 
memoir, the work is of great value; for, as heretofore stated, the fig. 
ures of those works they personally examined are generally correct. 
In some cases, it is true, inclosures are represented as true circles 
which are not such; but this is a very common error in archeological 
treatises. 
RESURVEY OF THE OHIO INCLOSURES. 
Having pointed out some of the errors of the ‘Ancient Monuments,” 
in reference to the measurements and dimensions of the circles, squares, 
and octagons, we will now present the result of the resurvey of the 
works by Mr. Middleton, as agent of the Bureau. 
““OBSERVATORY CIRCLE,” NEWARK. 
This circle, which is marked “IF” on pl. xxv of the Ancient Mon- 
uments, is situated at the extreme west of the great group, and is yet 
very distinct, being about 3 feet high at the lowest point, the aver- 
age height being between 4 and 5 feet. Most of the south half is 
yet in the original forest and has never been injured by the plow ; 
but the north half has been under cultivation for a number of years 
and is considerably worn. The effect of this wearing is apparent not 
only in the decrease in height, but in the increase in width of this por- 
tion, as shown by the field-notes given below. 
The chords in this survey were 100 feet each; the stations were on 
top of the wall as near the middle line as could be ascertained by 
measurement and judgment, and the stakes all set before the bearings 
