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52 



Series L. (March 1908). 

 The samples marked a were crushed directly after the tubers being split; the 

 samples marked b were allowed to stand for 3 days exposed to the wounding. The 

 potatoes were fresh and wounding-cork was formed after the exposure. Temp. 

 10—12°. 



M - -f-(l-U"/„. a = +r.-06"/„. 1/1 = + 3-03»|„. 



The results of Series L., which has no great value on account of (he small 

 number of the experiments, might indicate that the tubers in the last stage of the 

 resling-period are not able to react upon injury; this hypothesis is however contra- 

 dicted by the circumstance that wounding-cork is formed in potatoes that were 

 experimented on in the spring as well as in those that had been examined earlier; 

 even in germinating tubers wounding cork was observed as I have already de- 

 monstrated by a considerable number of experiments. As the results of Series L 

 however showed a considerable deviation from the results, found in A, it was 

 necessary to make another experimental series: M to investigate the matter. Un- 

 fortunately it was impossible to get further material of the same kind as used in 

 the other experiments; so "Magnum-bonum" potatoes were used for the last series. 



Series M. (May 1908). 

 "Magnum-bonum" potatoes. The samples marked a were crushed directly 

 after the tubers being split; the portions marked b were exposed to injury for 3 

 days. After the exposure the potatoes were fresh and wounding-cork was formed. 

 Temp. 12—13°. 



