igig] 



ROSE— BLISTER CANKER 



123 



of k being nearly the same in all 3 cases, although it is doubtful 

 whether a mean for table XII, column i, is really significant. 



TABLE XI 



Values of k calculated from data obtained in experi- 

 ments WITH apple bark, K2CO3, AND PYROGALLOL 



TABLE XII 



Values of k calcul.^ted from d.a,ta obtained in experi- 

 ments WITH APPLE B.\RK, PYROG.AXLOL, AND PYROCATECHIN 



/ (min.) 



IS- 



30. 



45- 

 60. 



75- 

 90. 



105. 

 120. 



135- 

 150. 

 165. 

 180. 



Healthy bark 

 and pyrogallol 



0.00246 

 0.00277 

 0.00322 

 0.00383 

 0.00493 

 O . 00460 

 0.00501 

 0.00584 

 0.00886 



Diseased bark 

 and pyrogallol 



0.00458 

 0.00528 

 00515 

 00515 

 00510 

 00530 

 00507 



00575 

 00604 



00744 



Healthy bark 



and pyrocat- 



echin 



0.00502 

 0.00429 

 0.00357 

 O . 00346 

 0.00416 

 0.00433 

 0.00426 

 0.00434 

 o . 00483 

 o . 00548 

 0.00590 



Diseased bark 



and pyrocat- 



echin 



O . 00483 

 O . 00494 

 0.00510 

 O . 00488 

 0.00526 

 0.00536 

 0.00553 

 0.00584 

 0.00613 

 o . 00690 

 0.00866 



Mean . 



o . 00430 



0.00527 



o . 0045 I 



0.00521 



Confirmation of the results with apple bark is found in 

 table XIII and table XIV, column 2, based on data obtained by 



