6o Cincinnati Society of Natural History. 



1050 feet is 12,600 inches, the half of which is 6300. The 

 number 63 feet is found on " The Bird''' in the Newark Mounds 

 and elsewhere. The third of 63 is 21, the inverse of 12, and 

 21X5=105, while 12X9=108- 



No. 2. The Junction Group, Ross Coanty, Ohio, on 

 Paint Creek, two miles south-west of Chillicothe ; Plate 22, page 

 6t. This group, in the connection, is exceedingly noteworthy, as 

 it shows a play upon the numbers 210 and 120, the sources re- 

 spectively of 1050 and 1080. It consists chiefly of two circles 

 which touch upon the opposite sides of a regular square, contained 

 in a larger square, whose sides are much rounded, almost circular. 

 One circle is 120 feet in diameter, the regular square is 120 feet to 

 the side, surrounded by a bank whose sha])e partakes of the nature 

 of a square and a circle. The circle upon the opposite side is 210 

 feet in diameter, or 105X2 feet; hence the unit of measure is 105 

 feet. Near this last is another circle 210 feet in diameter. Off to 

 one side, at some distance is a regular square of 160 feet to the 

 side, in a very symmetrical figure, 240 feet across, with sides 

 much rounded, and which partakes of the shape of the circle and 

 the square. 



No. 3. The remarkable " Oraded Way," near Piketon. 

 Pike Co., Ohio; Plate 31, p. 88. The measures of the "way," 

 combine in a special manner," those of Groups I and II. One 

 section of this " way "" is 1080 feet long. From this proceeds an 

 embankment 1500 feet long, at the end of which a bank runs off 

 at a slight angle, a length of 420 feet. In the side of the long 

 line, and at right-angles to it a bank projects 212 feet, then an 

 elbow runs parallel with the main line 420 feet, and from the 

 extremity of this last, diverging from it at a slight angle, a bank 

 runs in towards the main line a distance of 240 feet. Here is 

 unmistakable evidence of the purposed combination of the char- 

 acteristic measures 1050 and 1080 feet, of Groups I and II. 

 24 feet is 6X4, while 42 feet is 6X7- The fourth part of 4200 

 is 1050, while 180X6^=1080 feet. So, also, 212X2.5^=530, the 

 chord of the circle in the Hopeton Works, where 1080 is directly 

 connected with 1050. 



No. 4. The Portsmouth Works in Kentucky, opposite to the 

 old mouth of the Scioto river; Plate 28, ]). 78. This work con- 

 sists of two ways, or i)arallels, each 2100 by 210 feet, converging 

 from opposite directions on a square of 800 feet to the side. The 

 unit of measure is evidently 105 feet; or 21 as the inverse of 12. 



