GANNETT.] 
GEOGRAPHIC TABLES AND FORMULAS. 
107 
Table 13. — Areas of quadrilaterals of earth\s surface of 10' extent in latitude 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. 
o / 
/ 
o / 
84 05 
13.79 
86 05 
9.14 
88 05 
4.47 
84 15 
13.40 
86 15 
8.75 
88 15 
4.09 
84 25 
13.02 
86 25 
8.36 
88 25 
3.70 
84 35 
12. 63 
86 35 
7.97 
88 35 
3.31 
84 45 
12.24 
86 45 
7. 59 
88 45 
2.92 
84 55 
11.86 
86 55 
7.20 
88 55 
2.53 
85 05 
11.47 
87 05 
6.81 
89 05 
2.14 
85 15 
11.08 
87 15 
6.42 
89 15 
1.75 
85 25 
10.69 
87 25 
6.03 
89 25 
1.36 
85 35 
10.30 
87 35 
5.64 
89 35 
0.97 
85 45 
9.92 
87 45 
5.25 
89 45 
0.58 
85 55 
9.53 
87 55 
4.86 
89 55 
0.19 
