INTELLIGENCE, POWER, 



niche in the world of the living. Therefore, it should be no 

 surprise that there are as many variations in the size of the 

 brain, the heart, the thyroid gland, and the adrenal- 

 sympathetic system in the animals in the sea and on 

 the land as there are wave lengths and chemical units 

 in the great blanket of life that falls continuously upon 

 the sea and the land. 



The amount of oxygen available to the fish in the sea is 

 limited to the I or 2 per cent of oxygen in the water com- 

 pared with the 20 per cent of oxygen in the air available 

 to the animals on the land. 



The specific gravity of the fish is about the same as the 

 specific gravity of the sea water. Therefore, the fish has a 

 fundamental advantage over land animals in that the 

 warm-blooded land animals must carry their own weight, 

 whereas the weight of the fish is borne by the buoyancy of 

 the water. In consequence, fish develop neuromuscular 

 mechanisms primarily for attack or escape and not for the 

 maintenance of the warm-blooded state. 



Since the power of the fish is limited by the amount of 

 oxygen available in the water, we should expect to find a 

 small development of the heart and blood vessels and, 

 especially, of the capillaries in fish. The size of the brain 

 should vary in accordance with the number of neuro- 

 muscular patterns, that is, in accordance with the activity 

 of the animal. 



The jewfish is not found on the great highways of the 

 sea. It is found down the blind alleys. Like the lobster, the 

 turtle, the alligator, the crocodile, the jewfish is not a 

 hunter; he is a still fisherman. His build is for a stationary 

 rather than an active life. Therefore the ratio of the brain 

 weight of the inactive jewfish to its body weight would be 

 expected to be far below that of an active, aggressive, 

 hunting shark. 



Let us compare the energy-controlling mechanism of a 

 jewfish with that of a sand shark of approximately the 



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