ADAPTATIONS 



asked once why a certain physiological 

 fact was so, replied, " Because it wants 

 to be so!" 



If we did not prolong the consideration 

 of the adaptations of part to part in the 

 Eye, because the reader's patience would 

 be exhausted long before they were all 

 enumerated, what are we to do with the 

 Nervous System? An old anatomist well 

 said, the nervous system is the animal. He 

 is all there, to be sure, with more special 

 adjustments in his nervous make-up than 

 in all the rest of his body. In fact its 

 illustrations of marvellous fitnesses are 

 altogether too many for us, and so we will 

 leave the nervous system and allude, in 

 conclusion, to the place which one of four 

 mysterious organs has in the ordering of 

 our physical life. These four organs, the 

 Pituitary, the Thyroid, the Islands of 

 Langerhans, and the Adrenal Glands, 

 pass directly into the blood and not 

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