146 METABOLISM 



as a fundamental difference between plants and animals, since there are plants 

 which are quite unable to construct proteids out of nitrates and others which 

 require to be fed on carbohydrates previously synthesized. On the other hand 

 it would appear probable that more accurate study of the lower animals will 

 lead to the conclusion that the animal world also includes forms which more or 

 less closely resemble green plants in so far as their nitrogen requirements 

 are concerned. 



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