106 
GEOGRAPHIC TABLES AND FORMULAS. 
[BULL. 234. 
Table 13. — Areas of quadrilaterals of earUi's surface of 10^ extent inlatttude and longi- 
tude — Continued. 
[From Smithsonian Geographical Tables.] 
Middle lati- 
tude of 
quadrilateral. 
Area in square 
miles. 
Middle lati- 
tude of 
quadrilateral. 
Area in square 
miles. 
Middle lati- 
tude of 
quadrilateral. 
Area in square 
miles. 
/ 
/ 
/ 
64 05 
64 15 
64 25 
64 35 
58.33 
57.99 
57.64 
57.29 
70 45 
70 55 
71 05 
71 15 
44.05 
43.69 
43.32 
42.95 
77 25 
77 35 
77 45 
77 55 
29. 13 
28.76 
28.37 
27.99 
64 45 
64 55 
65 05 
65 15 
56.94 
56.59 
56.24 
55.89 
71 25 
71 35 
71 45 
71 55 
42.58 
42.22 
41. 85 
41. 48 
78 05 
78 15 
78 25 
78 35 
27.62 
27.24 
26. 85 
26.47 
65 25 
65 35 
65 45 
65 55 
55.54 
55.19 
54.83 
54.48 
72 05 
72 15 
72 25 
72 35 
41.11 
40.74 
40.37 
40.00 
78 45 
78 55 
79 05 
79 15 
26.09 
25.71 
25.33 
24. 95 
66 05 
66 15 
66 25 
66 35 
54.13 
53.78 
53.42 
53.06 
72 45 
72 55 
73 05 
73 15 
39.63 
39.26 
38.89 
38.52 
79 25 
79 35 
79 45 
79 55 
24. 57 
24.18 
23.80 
23. 42 
66 45 
66 55 
67 05 
67 15 
52.71 
52. 35 
52.00 
51.64 
73 25 
73 35 
73 45 
73 55 
38.15 
37.78 
37.41 
37.03 
80 05 
80 15 
80 25 
80 35 
23.04 
22.65 
22.27 
21.89 
67 25 
67 35 
67 45 
67 55 
51.28 
50.93 
50.57 
50.21 
74 05 
74 15 
74 25 
74 35 
36.66 
36.29 
35.91 
35.54 
80 45 
80 55 
81 05 
81 15 
21.50 
21.12 
20. 73 
20.35 
68 05 
68 15 
68 25 
68 35 
49.85 
49.49 
49.13 
48.77 
74 45 
74 55 
75 05 
75 15 
35.17 
34.79 
34.42 
34.04 
81 25 
81 35 
81 45 
81 55 
19.97 
19.58 
19.20 
18.81 
68 45 
68 55 
69 05 
69 15 
48.41 
48.05 
47.69 
47.33 
75 25 
75 35 
75 45 
75 55 
33. 66 
33.29 
32.91 
32.53 
82 05 
82 15 
82 25 
82 35 
18.43 
18.04 
17.65 
17.27 
69 25 
69 35 
69 45 
69 55 
46.97 
46.60 
46.24 
45.88 
76 05 
76 15 
76 25 
76 35 
32.16 
31.78 
31.40 
31.03 
82 45 
82 55 
83 05 
83 15 
16.88 
16.50 
16.11 
15.73 
70 05 
70 15 
70 25 
70 35 
45. 51 
45.15 
44.78 
44.42 
76 45 
76 55 
77 05 
77 15 
30.65 
30. 27 
29.89 
29. 51 
83 25 
83 35 
83 45 
83 55 
15.34 
14.95 
14.57 
14.18 
