I9I9] 



ROSE— BLISTER CANKER 



141 



water as required by the Lowenthal method; at the same time 

 duplicate samples were taken for moisture determination. What- 

 ever may have been the errors introduced by this method, the 

 agreement between duplicates taken for moisture determination 

 was very close in most cases, as is shown in table XXVI. 



TABLE XXVI 



Percentage of dry matter in duplicate samples of 

 various lots of bark analyzed 



Sample 



Healthy i . . . 



" ' 2. . . 



Diseased 4 . . . 



6... 



Dead 7 



" 8 



" 9 



Duplicate 2 



Average 



The results of the analysis of 9 different samples of bark are 

 shown in table XXVII. 



TABLE XXVII 



Percentage of tannin in healthy and diseased 

 apple bark 



The Lowenthal method probably determines merely the 

 easily water-soluble tannins, but fails to reach those tied up with 



..^di 



