the mean Denjtty of the Earth . 761 
7 - 
Depreffions below 0 in the S.W. quarter. 
Rings.] I j 
2 1 3 1 4 
5 | 6 | 7 | 8 9 | 10 | 11 | 12 | Radii 
I 
1 *65 1 
165 | 160 | 155 
15° 1 r 40 | 130 120 j no| 90 ,| 50 | 10 | 333- 
2 
i 4 °o | 
39 ° 1 3 So 1 370 | 350 | 33 ° 1 3 00 1 2 7 ° j 240 | 210 1 160 | 60 | 1000 
3 
j 600 | 
580 | 560 | 530 
5 °° 1 570 | 540 | 400 | 370 1.340 | 280 | 100 | 1667 
4 
1 740 1 
720 | 700 | 670 | 640 | 610 [ 580 j 530 | 490 | 440 | 370 | 160 | 2333 
5 
j 800 j 
800 | 800 | 77O j 740 | 710 j 660 6lO j 570 j 510 j 44O ] 23O 3OOO 
6 
1 780 j 
790 | 780 | 770 
780 | 8co | 790 I.700 | 650 | 590 | 510 [ 320 | 3667 
7 
1 700] 
7 10 720 | 730 | 7 So | 75 ° 1 7 So | 75 ° I 73 ° 1 670 | 600 | 400 1 4333 
8 
1 580 1 
590 | 600 | 6lO 
64O | 660 | 700 | 720 | 730 | 73O | 760 | 520 j 5000 
9 
! 49 ° 1 
490 | 490 | 480 | 49O | 510 | 600 | 65O | 660 | 69O | 580 | 45O j 5667 
10 
I 470 j 
460 j 420 | 400 j 420 | 420 | 440 | 49 ° 1 S 8 ° I 59 ° i S 6 ° i 43 ° I 6333 
1 1 
1 340 | 
340 | 340 j 340 | 340 | 33 ° 1 350 | 390 | 450 | 480 | 380 | 370 | 700c 
12 
1 210 1 
220 j 230 | 250 j 250 j 250 | 280 | 310 | 340 j 370 | 250 j 200 | 7667 
*3 
160 1 
1 50 | 140 | 120 
I30 | l^O j 200 | 23O | 280 | 290 | 23O j I I O j 8333 
H 
| 1 1 ° j 
90 60 | 20 
20 | 20 [ 70 | 150] 230] 240] I50 f 90 j 900C. 
15 
1 50 j 
20 | | 
| 40 j 14O j 180 | 90 j 50 j 9667 
16 
| 30 | 9O | 70 | 20 [10333 
8 
Depreffions below 0 in the S.E. quarter. 
Rings 
•1 1 1 
2 I 3 1 4 
1 Sl 6 1 7 1 8 | 9 | 10 | ji | 12 | Radii'. 
I 
1 i6 5 1 
165 1 160 j 15S 
1 * 5 ° 1 I 4 ° I 13° | 120 | 1 10 | 100 | 9 5 | 40 | 333-: 
2 
| 400 | 
400 | 400 | 400 | 4C0 | 390 | 380 | 360 | 330 | 300 | 250 | 1 10 | iooc 
3 
j 600 | 
610 610 | 610 | 
j 6lO | 600 [ 600 | 380 | 55O | 5OO 44O | 200 | 1667 
4 
1 760 I 
75 ° 1 740 | 740 | 740 | 73 ° 1 720 | 710 | 680 | 640 | 560 | 300 | 2333 
5 
| 800 j 
800 800 | 800 | SOO | BOO | SOO | 800 | 790 | 740 | 660 | 400 3OCO 
6 
1 78o | 
780 | 780 j 780 | 780 | 790 | SOO | 84O | 880 | 85O | 750 j 47O | 3667 
7 
| 700 | 
69O | 680 (67O 
| 670 | 680 | 620 | 720 | 820 | 9OO | 77O | 520 j 4333 
8 
1 58o | 
570 | 570 | 570 | 570 | 380 | 59O | 600 | 66O | 800 | 800 | 600 | 5000 
9 
| 49 ° j 
490 ] 49O | 49O | 49O | 490 | 49O | 500 | 520 | 700 j 880 | 600 j 3667 
10 
1 47 ° I 
460 | 450 | 440 | 430 | 420 | 410 | 430 j 470 | 530 | 880 j 680 | .6333 
1 1 
1 340 1 
330 j 320 | 320] 320 j 320 | 330 | 350 | 420 | 500 | 780 | 780 j 700c 
12 
1 210 1 
200 | 200 | 200 I 
; 21-0 | 220 | 24O | 280 | 39O | 480 | 680 | 9OO | 7667 
x 3 
1 120 1 
120 j 130 1 130 1 
140 | 150 | 180 | 230 | 300 450 | 600 | 990 j 833 . 
14 
j 1 1° 1 
I IO | IIO | 120 | 
I30 | 1 50 | 1 60 | 200 | 280 | 44O | 580 | 980 j 9OOC 
15 
i 70 | 
O 
O 
O 
| go | 120 | 140 "j 170 | 240 | 420 | 370 j 990 | 966' 
16 
1 10 I 
20 | 30 40 | 
50 | 80 | 120 | 160 | 220 | 400 | 550 |i'oooj 10337 
*7 | 
10 | 40 ] 90 | 140 | 200 | 340 | 540 | 950 ji 100 
is 
1 
| 5 | 40 | 1 10 | 170 | 300 | 500 ] 8 30 1 1 1 66 ■ 
*9 
1 
1 50 1 150 1 280 1 470 1 780 1 1233. 
20 
1 
| 20 | 150 | 250 | 400 | 700 I1300V 
5 B 
Vol. LXVIII. 
