THE NEWARK WORKS. 13. 
Speaking of the structure “ HE,” the authors say 
This work is not, as has generally been represented, a true circle ; its form is that 
of an ellipse, its diameters being 1,250 and 1,150 feet respectively. There are two or 
three slight irregularities in the outline; too trifling, however, to be indicated in the 
plan. The area of the inclosure is something over 30 acres. 
The area as indicated on the diagram is “30 acres,” hence the fair 
inference to be drawn from the ‘something over” in the descrip- 
tion is that the area is afraction over 30acres. A short calculation will 
suffice to show that an ellipse having the diameters given above will 
inclose only 26 acres, precisely the area given to this inclosure by At- 
water,! and little more than that obtained by the resurvey. We also 
notice, notwithstanding the authors’ statement in the text above quoted, 
thatCol. Whittlesey gives, on the plat (see sections ‘+ C, D”) the shorter 
diameter as 1,200 feet, measuring to the middle of the wall on each 
side. A careful resurvey made by the agent of the Bureau makes the 
longest diameter 1,189 feet and the shortest 1,163 feet, showing a differ- 
ence between the extremes of 26 feet. The figure is somewhat ellip- 
tical, though not so much so as represented in Ancient Monuments. 
The curve is not exactly regular. (See Pl. IL.) 
The field-notes of this survey are given hereafter. 
Squier and Davis state in the text that the cireular inclosure “TF” 
which connects with the octagon “is a true circle 2,880 feet, or up- 
wards of half a mile, in circumference.” The area indicated on the plat 
(no menticn 1s made of this in the text) is 20 acres, and the diameter 
given on the plat (section ‘a-b”) is ‘1,050 feet.” 
Now, it is evident that a panornerenee of 2,880 feet, the figure being 
a true circle, will have a diameter of but 917 feet, showing a difference 
between the text and the plate of 153 feet. The area of a circle of this 
size is but a slight fraction over 15 acres. 
According to the survey made by the Bureau agents, the field-notes 
and plat of which are given further on, the diameter from the observa- 
tory to the entrance to the octagon is 1,056 feet, and the one crossing 
this at right angles 1,050 feet, giving an area of 20 acres. Atwater,! as 
nearly as can be ascertained from his survey, made the diameter of this 
circle 1,100 feet, which gives an area of 22 acres. 
The area of the octagon, as indicated on the plate, is ‘50 acres ;” in 
the text it is stated thatit is “‘something over 50 acres.” Atwater, 
whose estimates of acres are generally more correct than those of Messrs. 
Squier and Davis, says? it contains “about 40 acres.” According to 
our resurvey, the notes of which are given hereafter, this area, includ- 
ing the inner halves of the walls, is but a small fraction over 41 acres. 
In their description of the Marietta works (pl. XXv1), after alluding to 
the earlier notices thereof, they say: 
Since that period various descriptions have appeared in print, and a number of plans 
differing materially ia their details have been publishe d. It is of so much importance, 
1 Archeol. “Americana, vol.1 (1320), p. 127 > [bid.,p. 126. 
