Hoagland — 70 — Plant Nutrition 



cells are so intimately related to and dependent on 

 processes of metabolism that it should not be hoped 

 that any real or hypothetical artificial cell or mem- 

 brane from which the factors of complex metabolism 

 are absent, can go far in imitating the processes by 

 which living cells absorb and accumulate solutes. It 

 is an unfortunate fact in this field of inquiry that 

 living cells often operate in a manner inconsistent in 

 one respect or another with mechanisms conceived to 

 explain their operation. 



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