7*) 



According to Wim.stättkh and Stom, (lUl.S, p. 221 j, llie assi- 

 iTiilalion wilh a fall of lem|)eralure seems to ho rclalively lavoun-d 

 in coinparison wilh Ihe respiralion, Ihis i)eii)g (hie lo Ihe facl that 

 Ihe primary CO.^ ahsorplion oC llie leaf-suhslance diminishes wilh 

 a rise in lemperalure. Possihly Ihis is one of Ihe reasons \vhy 

 Ihe temperature-coefficient for Ihe assimilation is lower Ihan for 

 Ihe respiralion and for simple chemicai processes (see Huown and 

 Heise 1917, WiLLSTÄTTEK and Stole 1918, p. 15()). K(oh)«icaIly 

 the relatively low temperalure-coefdcient for Ihe assimilalion nieans 

 Ihat the plants are able to assimilale to a considerabie extcnl even 

 at a ralher low lemperalure. 



The conditions of lemperalure in the förest and on Ihe open 

 shore on Hallands Väderö have been thermographically compared 

 for a number of summers. For the shore Ihe Ihermograph \\as 

 placed eilher out on an islel along a face of rock looUirn^ east 

 and was protected against direct sunhght (in 1917), or else in the 

 open on a chff-top (in 1918). 



The thermograph used for the foresl had ils place in 1917 in 

 one of the ålder- stumps in the so-called >inner» Ulagap Hog, and 

 therefore not in a specially prolecled spol. In 1918 it was placed 

 on the ground in Kajiellhamn Bog, half undenieath the uplurned 

 root of a fallen mounlain-ash, and was therefore enlirely prolecled 

 against sun and wind. I give below only Ihe avcrage maximum 

 and minimum figures for part of Ihe summers 1917 — 1918. The 

 conditions of lemperalure will he discussed in greater delail in 

 another connexion. 



Average fignres and averaqe times for maximum and minimum temperatares 

 in the forest and on the shore 



