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?ig. 1. lipp or Maryland, showing locations o" stations 

 employed for soy-bern cultures fnc climatic observe t ions . 

 (i->.fter iv.cLeenj 



Ihe environr.ental conditions to which the cultures of this 

 experiment were exposed were so controlled that the plants 

 might be regsrued as standard piants for the measurement of 

 climatic conditions in accordance with e suggestion made by 

 Livingston and :..cLean^''' . Since the problem of expressing 



V Livingston, B. li., and i.xLean, F. ^- A living climatolo- 

 gical instrument. Science, n, s. Ac: c62-c6'c. 1916. 



plant growtri in terms of climatic conditions that control it 



