WHAT IS PHYSICAL LIFE 



culiar fact is that if a collection of cells 

 from these islands, not larger than a pea, 

 be engrafted in another part of the body 

 where they will grow, no diabetes will fol- 

 low, though the pancreas itself be re- 

 moved. We can guess from this why 

 diabetes is the most insoluble problem in 

 medicine. 



We now pass on to take up the adrenals, 

 those small organs whose experimental re- 

 moval kills much more quickly than the 

 removal of the kidneys themselves. 



For the nervous system to make glands 

 seems rather a come down, to be justified 

 only by the high and important rank of the 

 structures so originated. But we may 

 expect anything out of the way in the per- 

 formances of the Great Sympathetic, that 

 third great nervous system in us which 

 we know to be more closely related to our 

 vitality than the spinal cord and the brain 

 put together. But so mysterious are the 

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