120 



bog), nor on Novbr. 11, 1906 (Ruder Hegn (wood)). In the upper 

 palisade-cells a red cell-sap occurs during winter, and then the 

 contents of these cells always give a good reaction for tannin. 

 But in the leaf tannin also occurs in the other cells of the 



Fig. 31. Vaccimuui Uxycoccos. 

 Transverse section of siem (Denmark), n; 180. (Phot.) 



mesophyll. There is scarcely any other difference hetween the 

 Danish and the northern specimens than the one indicated above. 

 The stem. The primary cortex consists of a fairly com- 

 pact tissue of parenchymatous cells with a rather slightly de- 



