144
APPENDICES.
In the following table the fœtuses are arranged in the order of the "pair- ing dates"
BO found :-
LIST OF BLUE Whale Fatuses, arranged IN THE ORDER OF THE POSSIble Dates of THE PAIRINGS.
APPENDICES.
Langth of Fetus.
Date of Observation.
Observed.
I.eas 800
mm.
145
Age of Fatus.
Days of dubuoquent Growth.
Plus 91 Days of Preliminary Development,
Possible Date of Pairing.
Length of Fætur,
Age of Foetus
Jam
man,
Date of Observatlon,
Possible Date of Pairing.
Observed.
Less 500
mm.
Days of Babeequent Growth.
Plus 91 Days
of Preliminary Development.
1875 July ?
1873
2,200
2,200
1,700
66
157
January 25-February 24
2,200
middle
*
2,200
1,700
66
157
February 8 circu
1,570
1895
6
1,070
42
133
23
23
1,570
11
A. NORTH ATLANTIO. 1870 July, end
mm.
mm.
B. SOUTH GEORGIA.
7,250
6,750
264
355
August 10 (1869)
1906
19
6,700
6,200
242
333
11
20 (1905)
1914 January 17
4,270
3,770
147
238
May 24 (1913)
?
end-August
5,720
5,220
204
295
October 9 circa
9
3,200
11
2,700
105
196
June 27 (1913)
1906 August 1
5,490
4,990
195
286
19 (1905)
13
E
12
2
3,050
2,550
100
191
July 5 (1913)
2,590
2,090
82
173
1881 June 20
1886 July ?
&
4,130
3,630
142
233
13
30 (1880)
25
13 (1913)
1913 December 12
508
8
0
91
September 12
4,727
4,227
165
256
13
18 November 17 (1885)
18
597
97
4
95
14
1
"
1883 1900
27
4,450
3,950
154
245
15
November 24 (1882)
1914 January 12
1,120
620
24
115
19 (1913)
10
$1
3,985
3,465
136
227
25 (1899)
1881
19
4,070
3,570
139
230
"
December 1 (1880)
1890 August 20
4,760
4,260
166
257
6 (1889)
1884 July 21-Angust 2
3,965
3,465
135
326
נו
7-18 (1883)
Blue Whales.-Distribution of pairings in corresponding months of the northern and southern hemispheres (simple pregnancies only).
==
August 15-27
4,727
4,227
165
256
8 circa (1883)
14 (prior to)
4,575
4,075
159
240
11
10 circa (1883)
Jaly 8
3,600
3,000
117
208
12 (1883)
1887
10
3,300
2,800
109
200
11
11
22 (1886)
1883 June
3
2,272
1,772
69
160
25 (1882)
Month.
1886
21
8,745
2,245
87
178
25 (1885)
North Atlantic.
Number of Pairings.
Month,
South Georgia.
Number of
Pairings.
1900 May 31
2,135
1,635
64
155
27 (1899)
1883
24
1,880
1,380
54
17
1869 November 3
5,950
5,450
1881 June 18
2,270
1,770
D
July 12
2,680
2,180
1911
15
8,440
1,940
23
1884 June ?
1,900
1,400
July?
2,500
2,000
1886 June t
1,700
1,200
1874 July, middle
2,347
1,847
1884 August 7
2,900
2,400
1886 June 2
1,110
610
10
1,320
820
1874 20
13
1,550
1,050
1883 July 13
2,100
1,600
June 9
1,153
653
1882 July 30
2,455
1,955
15
1,870
1,370
11
1887
7
1,560
1,060
"}
1884
?
1,880
1,380
#
१
1,516
1,016
11
1901 June 20
940
440
1913 August 18...
2,440
1,940
1901 June 29
1,130
630
1886 August 20
2,440
1,940
1881 July 26
1,725
1,225
1901
4
1,080
580
11
1883
14
1,285
785
13
June 22
660
160
32
28
660
160
DI
1885 July?
960
460
1881
"
1878
28 18
1,140
640
600
100
1288282526*8¬8888-89=8RP?RCURY
145
23
30 (1882)
August
304
January 3
September
160
9
19
October...
176
17
11
November
76
167
29
F
December
11
55
146
บ
6- February 4
January
78
169
13-
12
31
"
February
47
138
14--
12
"
13
March
421720
2
February March
April ...
May
June
July
August
September
72
163
February 2 circa
April
2
October
94
185
3
May
24
115
7
11
June
32
123
7
July
(pairing observed at
Fiumark)
November
December
January
(evidence of recent impregnation in some whales captured in these months)
132
8
153
10
116
13
JI
Total
50
7
167
13
*
144
21
11
132
25
11
145
6 March
8
#
40
131
20
22
17
108
March 4
167
4
#
116
167
6
139
9
11
114
12
122
14
"
97
17
"
97
23
109!
11
14-April 13
116
April 3
95
14
NORTH ATLAntio—Twins.
1905 June*
1,830 1,220
1,330 720
52 28
143 119
January 9 February 7 February 2-March 3
* N.B. This case is recorded from the Faroes by Harvie-Brown as a blue whale, but it was in all probability a finger. See p. 141.
The remarks made above (at p. 122), concerning the finner foetuses, as to the sible worthlessness of the "pairing dates" qua dates, and as to their apparent value for purposes of comparison, apply with equal force to the "pairing dates" given in the above table for the foetuses of the blue whales. The summary which follows the table shows clearly that the sexual season of the blue whale is, in all probability, very similar in character to that of the finner. The calculations respecting the fœtuses from the North Atlantic, coupled with the field observations made on the Norwegian coast, indicate that pairing may happen in practically all months of the year; but the calculations show also that the pairings for the great majority of the foetuses date from a period of four contiguous months, which appear to be December, January, February, and March. Had the preliminary development been assumed to take three months instead of two (an assumption which may well be nearer the truth than the one actually made), precisely the same four months would have been found to represent the sexual season of the great majority of the finners (cf. the table at p. 122). The few blue whale foetuses examined at South Georgia and the observations made by Major Barrett-Hamilton on the genitalia of some of the females landed at Leith Harbour in December and January give, so far as they go, corresponding evidence.
The fact which appears to be established by these calculations, viz., that the great majority of the blue whales pair in a definite, though long, season, is in almost complete harmony with Collett's statement that "the majority.
. give
pos-
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