MEAN DENSITY OF THE EARTH. 
377 
Compartment Heights (Sectors XI to XIX). 
Unit — 100 Feet. 
Circle. 
XI. 
XII. 
XIII. 
XIV. 
XV. 
XVI. 
XVII. 
XVIII. 
XIX. 
Sums. 
1 to 2 
6.0 
5.0 
5.0 
4.0 
4.0 
3.0 
3.0 
2.5 
1.0 
33.5 
2 “ 3 
7.0 
6.0 
7.0 
5.5 
5.0 
4.0 
3.5 
2.5 
1.0 
41.5 
3 “ 4 
9.0 
8.0 
8.0 
7.0 
6.0 
4.5 
4.0 
3.0 
1.0 
50.5 
4 “ 5 
11.0 
10.0 
10.0 
9.0 
7.5 
6.0 
4.5 
3.0 
2.0 
63.0 
5 “ 6 
12.0 
11.0 
11.0 
10.5 
9.0 
7.0 
5.0 
3.0 
2.0 
70.5 
6 “ 7 
12.5 
12.0 
12.0 
11.0 
10.0 
8.0 
5.0 
3.0 
2.0 
75.5 
7 “ 8 
14.0 
12.5 
12.5 
12.0 
11.0 
9.0 
5.0 
3.0 
2.0 
81.0 
8 “ 9 
15.5 
14.0 
14.5 
13.0 
12.0 
10.0 
6.0 
4.0 
2.0 
91.0 
9 “ 10 
17.0 
15.5 
15.5 
14.0 
12.5 
11.0 
7.0 
4.0 
2.0 
98.5 
10 “ 11 
18.0 
17.5 
17.0 
14.5 
13.0 
12.5 
10.0 
5.0 
1.0 
108.5 
11 “ 12 
21.5 
19.5 
18.0 
15.5 
15.0 
14.5 
12.0 
6.0 
0.5 
122.5 
12 “ 13 
24.5 
22.0 
20.0 
17.0 
19.0 
17.5 
14.0 
8.0 
2.0 
144.0 
13 “ 14 
27.0 
26.0 
24.0 
21.0 
22.0 
21.0 
16.0 
10.0 
2.5 
192.0 
14 “ 15 
32.0 
31.0 
30.0 
24.0 
25.0 
23.0 
19.0 
11.0 
3.0 
198.0 
15 “ 16 
37.0 
37.0 
34.0 
30.0 
32.0 
27.0 
22.0 
15.0 
5.0 
239.0 
16 “ 17 
40.0 
43.0 
40.0 
36.0 
34.0 
30.0 
23.0 
' 16.0 
7.0 
269.0 
17 “ 18 
47.0 
54.0 
50.0 
41.0 
39.0 
33.0 
27.0 
17.0 
8.0 
316.0 
18 “ 19 
55.0 
60.0 
56.0 
50.0 
44.0 
35.0 
27.0 
20.0 
10.0 
357.0 
19 “ 20 
65.0 
67.0 
62.0 
55.0 
45.0 
35.0 
25.0 
21.0 
10.0 
385.0 
20 “ 21 
75.0 
60.0 
50.5 
45.0 
42.0 
37.0 
28.0 
20.0 
10.0 
367.5 
21 “ 22 
72.0 
65.0 
55.0 
47.0 
40.0 
37.0 
30.0 
26.0 
9.0 
381.0 
22 “ 23 
76.0 
69.0 
62.0 
56.0 
47.0 
40.0 
40.0 
27.0 
7.0 
424.0 
23 “ 24 
65.0 
59.0 
55.0 
52.0 
46.0 
40.0 
40.0 
32.0 
5.0 
394.0 
24 “ 25 
55.0 
50.0 
46.0 
45.0 
45.0 
42.0 
40.0 
32.0 
6.0 
361.0 
25 “ 26 
47.0 
39.5 
36.0 
35.5 
37.5 
37.5 
34.5 
22.5 
1.0 
291.0 
26 “ 27 
37.5 
30.0 
26.5 
28.0 
29.0 
31.0 
28.5 
16.0 
0.0 
226.5 
27 “ 28 
28.5 
21.0 
18.5 
19.5 
21.5 
20.0 
14.5 
5.5 
149.0 
28 “ 29 
16.0 
7.5 
7.5 
7.0 
5.0 
6.5 
4.5 
1.0 
55.0 
29 “ 30 
3.5 
30 “ 31 
31 “ 32 
32 “ 33 
33 “ 34 
34 “ 35 
49—Bull. Phil. Soc., Wash., Vol. 12. 
