— 153 — 



Although therefore the rate of transpiration is about the same 

 for the four high -moor plants it must not he concluded that the xero- 

 morphy existing in two of them is of no significance for the trans- 

 piration ; the fact is that the diminution in the rate of transpiration 

 produced by the xeromorphy is compensated for by the stomata, 

 these beeing more open in the xeromorphic plants than in the others. 

 Yet it is possible that a difference in the transpiration of the two 

 groups of plants may be found in years with greater rainfall. 



These investigations have been carried out by aid of a grant 

 from the Carlsberg Fund. My best thanks are due to the direction. 



June 19th 1916. 



Botanisk Tidsskrift. 3G. Bd. 



11 



