CONCLUSIONS. 25 
two left flappers, it would turn to the right; consequently when 
the right foreflapper (leaving for a moment the hindflappers out 
of consideration) is moved backwards with a strong action, the 
head must move a little to the left, and it will move to the right, 
when the left foreflapper is propelled backwards. 
The instances in which the animal swims with its body im a 
straight line, propelling itself only with its flappers, are few in 
comparison with its swimming with vertical undulations (8, 15, 34, 
soeeno, 59°°S3, 93, 104, 115, 118, 120, 129; 30; 13231337 143; 
145, 146, 147, 150, 160, see also figg. 28, 29, 31, 36, 45). The 
animal in this position resembled some drift of sea-weed (143), a 
mast of a vessel floating (83), an enormous log of timber floating 
(83), a trunk of a large tree floating (104), an unwrought spar 
(18), a long spar (150), a log of wood (150), an immense tree 
floating (157). 
A change in its mode of swimming is sometimes also witnessed , 
it may be that it first swam with vertical undulations, and then 
with its body in a straight line, or vice versa (3, 83, 115). 
In swimming the end of the tail only (118, 122, 146), or nearly 
the whole tail (81, 34, 38; 60, 63, 69, 74, 80, 81, 85, 93, 102, 
114, 115, 121, 148, 150) is concealed under water and invisible. 
The flappers are always below the surface of the water and invisible 
(31, 34, 80, 85, 122, 138, 146, 150), save the above-mentioned 
four times (118, 129, 187, 148). The head may be held just at 
the surface of the water (31, 39, 44, 66, 74, 91, 187, 146, 148, 
fige. 32, 33, 37, 38), so that: it sometimes is recorded as not 
having been visible (41, 113, 114), or may be, and this is gene- 
rally the case, held above water (31, 44, 51, 68, 83.) Ole Om 
128, figg. 24, 26, 27, 28, 29, 51). The height above water is said 
to be but little (94), some feet (70), well above water (150), 
several feet (155), high (32), considerable (102), quite erect in the 
air (95), six inches (48, 63), eight inches (44), one foot (38, 41, 
42, 92, 137, 138), two feet (9, 39, 63, 80, 138), three feet (63), 
four fect (17, 19, 29, 60, 118), five feet (19, 29, 60), six feet 
(60, 74, 97), seven feet (60, 101, 142), eight feet (101), ten or 
twelve feet (131). 
The head may, of course, sometimes be gradually laid down 
(63), or gradually raised higher (51), is generally held in an acute 
angle (94), which is of course the case when it is only a few feet 
above the surface, and the angle becomes the less acute the more 
the head is elevated; but sometimes the neck is curved (97) in 
