Appendix—Statistical Tables . 
443 
Table F.— D. hyalina. Average, maximum, and minimum numbers. 
Percentile vertical distribution. 
Av. 
Max. 
Min. 
Per cent, in each 3 m. level. 
0-3. 
3-6. 
6-9. 
9-12. 
12-15. 
15-15. 
1894. 
July 1-15... 
19.8 
32.8 
8.5 
38.1 
23.4 
20.2 
14.1 
3.2 
0.9 
July 16-31.. 
13.3 
34.4 
2.7 
43.4 
33.5 
19.7 
2.5 
0.9 
0.0 
Aug. 1-15.. 
16.6 
33.3 
9.3 
43.5 
26.5 
23.5 
6.2 
0.0 
0.3 
Aug. 16-31. 
Sept. 1-15.. 
60.7 
No ob 
82.7 
servat 
47.8 
ions. 
42.7 
29.0 
22.2 
4.2 
0.0 
0.0 
Sept. 16-30. 
148.4 
212.7 
74.4 
30.6 
25.2 
21.1 
16.3 
6.0 
0.8 
Oct. 1-15... 
207.6 
461.7 
117.3 
32.0 
26.1 
17.5 
9.7 
6.2 
8.4 
Oct. 16-31 . 
252.5 
531.0 
98.3 
31.7 
19.6 
17.1 
11.7 
11.6 
8.3 
Nov. 1-15... 
Nov. 16-30. 
183.1 
462.6 
No ob 
92.2 
servat 
37.1 
ions. 
21.3 
13.9 
12.2 
8.9 
6.6 
Dec. 1-15.. 
Dec. 16-31 
121.5 
(48.8) 
154.2 
56.9 
78.2 
40.7 
41.1 
16.0 
16.7 
12.0 
8.7 
5.5 
1895. 
Jan. 1-15... 
40.8 
65.4 
36.7 
24.1 
18.7 
16.7 
18.7 
10.9 
10.9 
Jan. 16-31 . 
55.9 
61.0 
53.4 
30.4 
27.7 
5.3 
11.2 
12.7 
12.7 
Feb. 1-14 \ 
Feb. 15-28 
65.8 
109.4 
41.9 
18.1 
19.9 
11.0 
9.8 
20.6 
20.6 
Mch. 1-15 . 
34.7 
69.3 
25.6 
22.9 
26.9 
19.2 
12.4 
9.1 
9.5 
Mch. 16-31. 
63.6 
102.3 
39.1 
28.1 
22.7 
8.1 
8.1 
16.5 
16.5 
Apl. 1-15... 
26.4 
24.2 
12.7 
42.7 
21.0 
10.1 
7.5 
9.3 
9.4 
Apl. 16-30 . 
16.3 
43.8 
3.2 
37.5 
29.7 
9.4 
11.3 
5.1 
7.0 
May 1-15... 
28.9 
81.4 
7.9 
67.0 
22.2 
5.7 
2.6 
1.3 
1.1 
May 16-31 . 
250.7 
349.8 
71.2 
59.1 
24.3 
9.9 
3.0 
2.3 
1.4 
June 1-15 . 
319.2 
564.8 
183.1 
42.2 
19.4 
12.5 
11.5 
6.6 
7.8 
June 16-30. 
135.6 
327.5 
31.8 
51.0 
13.3 
19.2 
6.6 
4.3 
5.5 
July 1-15... 
139.9 
263.9 
21.0 
56.1 
20.9 
17.7 
4.4 
0.5 
0.4 
July 16-31 . 
275.3 
464.3 
129.7 
58.3 
24.1 
15.7 
0.9 
0.2 
0 8 
Aug. 1-15 . 
273.0 
417.2 
78.2 
47.6 
26.6 
13.8 
10.7 
1.1 
0.3 
Aug. 16-31. 
252.8 
428.6 
143.1 
51.1 
17.6 
17.8 
12.6 
0.7 
0.2 
Sept. 1-15 . 
202.8 
349.1 
169.8 
49.5 
23.2 
21.3 
4.6 
1.1 
0.3 
Sept. 16-30. 
201.6 
248.0 
148.1 
37.0 
20.8 
16.9 
11.4 
9.6 
4.3 
Oct. 1-15... 
180.5 
253.1 
123.3 
36.9 
14.9 
12.1 
12.5 
10.9 
12.7 
Oct. 16-31 . 
76.6 
111.3 
54 0 
37.9 
15.9 
15.1 
13.0 
10.3 
7.8 
Nov. 1-15 ., 
56.2 
72.5 
38.8 
32.8 
21.9 
12.7 
14.7 
10.6 
7 2 
Nov. 16-30. 
48.2 
60.4 
36.2 
31.3 
15.8 
15.0 
14.8 
12.8 
10.3 
Dec. 1-15 . 
35.0 
41.9 
26.4 
33.9 
32.7 
18.7 
7.3 
4.2 
3.2 
Dec. 16-31. 
44.6 
52.7 
11.4 
38.5 
29.2 
9.3 
12.1 
9.5 
1.4 
1896. 
Jan. 1-15... 
36.2 
57.8 
15.2 
31.7 
35.8 
19.9 
4.8 
4.2 
3.6 
Jan. 16-31 . 
17.3 
20.3 
10.8 
41.0 
25.4 
19.1 
6.4 
4.7 
3.4 
Feb. 1-14 . 
Feb. 15-29 . 
Mch. 1-15 . 
19 6 
27.0 
29.6 
13.3 
26.9 
37.6 
24.2 
21.2 
12.7 
15.3 
10.7 
7.0 
10.6 
14.1 
14.9 
4.7 
Mch. 16-31. 
13.5 
27.3 
6.9) 
32.1 
14.1 
34.9 
10.4 
4.7 
3.8 
