THE TOXIC ACTION OF ORGANIC COMPOUNDS AS 



MODIFIED BY FERTILIZER SALTS 1 



Oswald Schreiner and J. J. Skinner 



(with FIVE figures) 



former 



compound isolated from 



* 



unproductive soils, was presented. The results obtained with this 

 organic soil constituent, showing its effect on growth and absorp- 



from 



composition 



obtaining further information 



other 



bodies known to be harmful 



with 



some of the results obtained in experiments 



mixtures of different composition 



The compounds studied, though not actually isolated from 



common constituents of Dlant debris, or result from 



and 



soil. 



ge number of such com 



growth was given in an earlier paper. 3 Of these compounds, 

 cumarin was selected for the continuation of these researches 



harmful even in minu 



million 



o 



common constituent of a number 



remains of which g 



obtained 



distilled water. The present investigation concerns itself with 

 the effect of cumarin in the presence of nutrient salts as well, the 



Published by permission of the Secretary of Agriculture, from the Laboratory 

 of Fertility Investigations. 



2 Schreiner, O., and Skinner, J. J., Some effects of a harmful organic soil con- 

 stituent. Bot. Gaz. 50:161. 1910. 



3 Schreiner, O., and Reed, H. S., The toxic action of certain organic plant 

 constituents. Bot. Gaz. 45:73, 271. 1908. 



31 [Botanical Gazette, vol. 54 



