88 
ANATOMY AND PHYSIOLOGY 
There is a long cylindrical bone that is not articulated, 
which is slightly curved, and is in length 2 feet 3 inches, 
and 5 \ inches in diameter; it appears to have been 
tipped with cartilage at both ends, and has probably 
belonged to the root of the genital organ e 
OF THE MUSCLES* 
The flesh or muscles of this order of animals,” savs 
Hunter, £< is red, resembling that of most quadrupeds, 
perhaps more like that of the bull, or horse, than any 
other animal; some of it is very firm, and about the 
breast and belly it is mixed with tendon. Two por- 
tions of muscles of the same shape, one from the psoas 
muscle of the whale, the other of an ox, when weighed 
in air, were both exactly five hundred and two grains, 
but weighed in water, the portion of the whale was four 
grains heavier than the other. It is probable therefore 
that the necessary equilibrium between the water and 
the animal is produced by the oil. 
Although the body and tail are composed of a series 
of bones connected together, and moved as in fish, yet 
their movements are produced by long muscles, with 
long tendons, which render the body thicker, while the 
tail at its stem is smaller than that of any other swim- 
mer whose principal motion is the same. Why this 
mode of applying the moving powers should not have 
been used in fish, is probably not so easily answered; 
but in fish the muscles of the body are of nearly the 
same length as the vertebrae. The depressor muscles of 
