In comparing the number of the diseased ears of the different 

 plots with the untreated plot, it will be seen that both copper sulphate 

 and Cyllin reduce the amount of " smut," and that the stronger the 

 solution the less " smut " is apparent, but that if the solution be too 

 strong, the germination is affected to such an extent that the yield 

 is considerably reduced. From the above table it will be seen that 

 the seed treated with one-half per cent CuS0 4 solution gave a higher 

 yield than the untreated seed, due to the smaller percentage of dis- 

 eased ears in the treated plot. The table also indicates that all the 

 Cyllin solutions were too strong ; moreover that a copper sulphate 

 solution stronger than two per cent should not be used, from which 

 it follows that the employment of a ten per cent solution of the latter, 

 which was that previously recommended, is not advisable. 



The experiment should therefore be repeated with weaker solu- 

 tions of Cyllin and with copper sulphate solutions varying in strength 

 between one-half to two per cent. 



