110 NATUEAL HISTOEY. 



you that the great object of breathing is to change dark 

 blood into red blood, and that the blood, as it returns to 

 the heart from all parts of the body of a dark color, is 

 sent to the lungs to be changed to red blood, before it is 

 again distributed over the system. Red blood is neces- 

 sary to every organ, to have life go on ; and if it could 

 be supplied to all the organs without breathing, then the 

 breathing could be suspended without destroying life. 

 Now the Whale has large reservoirs where the red blood 

 accumulates while it is up at the surface of the water 

 breathing. When, therefore, it goes down, every part 

 of its body is supplied with red blood from these reser- 

 voirs. When the supply is gone, the Whale feels un- 

 comfortable, and rises to the surface to renew the sup- 

 ply. The nostrils are near the highest part of the head, 

 so that it can breathe as soon as it reaches the surface. 

 These orifices, and also the openings of the ears, have 

 valves, which can close so tightly that, even when subject- 

 ed to the pressure of a great depth of water, not a drop 

 can enter. 



188. The nostrils are the blow-holes. The Whale has 

 a curious apparatus for spouting. There are two large 

 pouches under the nostrils, which can be filled with wa- 

 ter taken in by the mouth. Here it can be retained by 

 an arrangement of valves till the Whale wishes to spout; 

 and then, by a forcible compression of the pouches, the 

 Avater is throAvn upward through the blow-holes, the 

 valves of which are pushed ojjen. 



189. The true Whales are of two kinds or families: 

 1. The Spermaceti Whale, which has teeth in the lower 

 jaw. 2. The Whalebone Whale, which has no teeth. 

 Of the Spermaceti Whales there are two species, the 

 most common of which, the Cachelot, or Sperm Whale, 

 Fig. 93 (p. Ill), I will notice. When full-grown it is 

 from seventy to eighty feet long. The capture of this 

 animal is attended with even greater danger than that 

 of the Greenland Whale, on account of its formidable 



