172 



Plant Tissue Culture 



Example 3 



Koot-pressures balanced against compressed air of measured 



■nrp.ssnrp. Vfl.lllAfl 



25 



pressure values 



Set up June 15, 1937 



other cultures within the series with the control, 

 on a percentage basis. The percentage results 

 can then be compared from one experiment to 

 another, which could not be done with the absolute 

 values. Thus, in two series (White, 1940, 232) on 

 the effects of vitamin B<$ on two different strains 

 of roots, one strain in an experiment using 1.0 

 ppm. vitamin B 6 as the only organic accessory 



