FIXATION BY LEGUMINOUS PLANTS 13 



apparent, and the long controversy as to the sources of 

 nitrogen in vegetation was thus closed by a vindication of 

 both schools of opinion. 



TABLE V. Nitrogen Balance-sheet, Leguminous Plants. (See p. 12.) 



* Indium^ caicium iSiirale, added as follows : Pot 7, 0-2298 gram. ; Pot 28, 0-8042 gram. ; and Pot 87, 



O'tiiitiS grain. 

 t Including also the following amounts of Nitrate recovered : Pot 7, none ; Pot 23, 0-0239 gram. ; and 



Pot 37, 0-1805 gram. % Accidentally inoculated. 



-, 



Lawes and Gilbert were perfectly correct in maintaining 

 that the ordinary green plant has no power of fixing nitrogen, 

 but the whole class of leguminous plants form an exception 



