BY R. GRKIG SMITH. 



59 



one c.c. of normal acid, using phenolpbthalein as an indicator. 

 The extracts were neutralised with sodium bicarbonate. The 

 Fusarium, the Rhizobium, and the control-tests were incubated 

 for five davs at 22°. 



The point to be noted from this set of tests is, that the neu- 

 tralisation of the acidity of the extract has converted the toxic 



