\ve been 'published by the Hertfordshire Natural History Society. 
Period. 
Years. 
Decades. 
Latitude. 
Longitude. 
Diameter 
of 
Gauge. 
H eight of top of 
Gauge above 
Ground. 
Sea-level. 
O 
/ 
n 
O 
/ 
n 
ins. 
ft. 
ins. 
ft. 
883, 84 
52 
1 
O N 
0 
3 
O E 
5 
1 
O 
322 _ 
876-89 
3 
1860-89 
52 
2 
34 n 
0 
1 
8 w 
8 
0 
6 
269 /]\ 
881, 82 
52 
1 
25 N 
0 
6 40 w 
5 
0 
10 
2 57 _ 
877-87 
52 
1 
28 N 
0 
6 
41 w 
5 
1 
0 
263 /j\ 
876-89 
4 
1850-89 
• 5 i 
57 
O N 
0 
16 
20 w 
5 
2 
1 
238 J . 
878-89 
1 
1880-89 
5 i 
57 
40 N 
0 
20 
0 w 
5 
1 
1 
422 /j\ 
882-89 
5 i 
47 
33 n 
0 
39 
25 w 
5 
1 
0 
442 T 
876-89 
2 
1870-89 
5 i 
47 
O N 
0 
36 
30 w 
10 
4 
2 
345 L 
885-89 
5 i 
45 
40 N 
0 
33 
30 w 
8 
1 
0 
4 °i /j\ 
876-84 
2 
1860-79 
5 i 
45 
30 N 
0 
33 
30 w 
8 
1 
6 
37 o B 
876 
5 i 
44 
55 n 
0 
35 
50 w 
5 
1 
0 
55 o 
877-89 
! 
1880-89 
5 i 
47 
20 N 
0 
30 
30 w 
8 
1 
0 
426 T 
875-89 
5 
1840-89 
5 i 
44 
O N 
0 
26 
40 w 
12 
3 
9 
237 /]\ 
876-89 
2 
1870-89 
5 i 
5 i 
30 N 
0 
30 
0 w 
5 
1 
0 
630 B 
876-89 
3 
1860-89 
5 i 
48 
IO N 
0 
21 
30 w 
5 * 
0 
9 
420 j 
887-89 
5 i 
45 
9 N 
0 
20 
6 w 
5 
1 
0 
380 J 
876-89 
3 
1860-89 
5 i 
45 
20 N 
0 
23 
0 w 
6 sqr. 
2 
6 
4I 3 7 f 
875-77 
1870-79 
5 i 
40 
IO N 
0 
24 
55 w 
5 
1 
3 
258 
875-81, 87-89 
5 i 
40 
5 N 
0 
24 
20 w 
5 
5 
6 
273 T 
876, 77 
5 i 
40 
5 N 
0 
24 
IO w 
5 
1 
0 
270 T 
878-86 
5 i 
39 
41 N 
0 
23 
30 w 
5 
1 
0 
221 T 
875 - 7 7 , 79-88 
5 i 
39 
25 N 
0 
23 
35 F 
5 
1 
0 
240 j 
875 , 76 
5 i 
39 
IO N 
0 
24 
20 w 
5 
1 
3 
235 
876-82 
5 i 
38 
50 N 
0 
22 
50 w 
5 
0 
6 
220 
879, 81, 82, 89 
5 i 
38 
O N 
0 
20 
0 w 
5 
1 
0 
480 
876-89 
1 
1880-89 
5 i 
37 
30 N 
0 
26 
20 W 
5 
2 
0 
340 ^ 
876-89 
1 
1880-89 
5 i 
49 
50 N 
0 
12 
30 W 
5 
0 
6 
228 T 
: 878-89 
1 
1880-89 
52 
2 
O N 
0 
10 
0 w 
5 
1 
0 
386 T 
877—87 
5 i 
52 
30 N 
0 
12 
30 w 
5 
1 
0 
39 i 7 j\ 
876-83 
1 
1870-79 
5 i 
55 
5 n 
0 
11 
40 w 
8 
2 
0 
3 : 9 L 
[889 
5 i 
57 
20 N 
0 
9 
30 w 
5 
0 
9 
500 ? 
[884-89 
5 i 
53 
45 N 
0 
5 
20 W 
5 
1 
0 
408 /js 
[877-89 
1 
1880-89 
52 
1 
O N 
0 
3 
O W 
5 
4 
3 
5 °o 
[880-89 
1 
1880-89 
5 i 
57 
5 N 
0 
3 
O W 
5 
1 
0 
484 T 
[876-78 
5 i 
56 
IO N 
0 
1 
40 W 
5 
1 
1 
329 T 
[876-89 
2 
1870-89 
5 i 
5 i 
24 N 
0 
4 
38 E 
5 
1 
0 
222 b 
[882-84 
5 i 
49 
O N 
0 
1 
O W 
5 
1 
0 
253 T 
[878-84, 89 
5 i 
48 
O N 
0 
14 
O W 
8 
1 
0 
250 ? 
1876—89 
3 
1860-80 
5 i 
46 
30 N 
0 
5 
30 w 
8 
1 
2 
250 
1877-89 
1880-80 
5 i 
46 
O N 
0 
6 
0 w 
12 
3 
0 
114 j 
1883-89 
5 i 
49 
30 N 
0 
1 
30 w 
8 
1 
0 
253 T 
1881-83 
5 i 
45 
40 N 
0 
0 
30 w 
8 
1 
6 
147 
1:876, 77 
5 i 
45 
40 N 
0 
0 
50 E 
20 
3 
0 
82 
1888-89 
5 i 
44 
30 N 
0 
1 
O W 
5 
1 
0 
118 J 
1888-89 
5 i 
42 
5 n 
0 
2 
50 W 
5 
1 
1 
94 
1887-89 
5 i 
39 
5 N 
0 
10 
15 w 
8 
0 
9 
212 
1877-89 
1 
1889-89 
5 i 
37 
40 N 
0 
8 
0 w 
5 
0 
6 
240 J 
)re in area. + Previously to 1881, Rev. H. S. Mott, 
mpany’s gauge. || Previously to 1883, James Muir, C.E. 
[To follow p. 88. 
