390 



pharostoma trichophyllum, Änthelia julacea, Martinella Bart- 

 lingiij Aplozia sphœrocarpa v. lurida, Jungermannia quinque- 

 dentata, J. ventricosa and J. inflata. 



North of this hollow was found a considerably higher 

 area where the sand had been blown together to downs of up 

 to 10m height in lee of solid rocks; how much of them 

 was sand and how much rock could not be decided with cer- 

 tainty, but the rocks protuding at several places in the northern 

 and north-western sides surely occupy the greater part. The 

 surface of the down is completely smooth, has an inclination 

 of 10 — 12° towards south and is wholly bare of vegetation. 

 The sand is loose and fine. The sun heats the surface greatly; 

 but the warmth does not penetrate very deeply, which is shown 

 by the under- noted observation taken on the 6^^^ of August at noon. 



On the down 



In a Sotø-bush^) 



Black ball . 

 Green ball . 

 5 cm deep . 

 55 cm deep 

 The air 



24°,5 

 25°, 5 

 15° 

 0° 

 11° 



24° 

 21° 

 13°,3 



11 



Here some observations by Hartz of the temperature in a 

 south-exposed sandy slope with loose drift sand in Klitdalen 

 may be added; the slope was abt. 1,5 m high., and the sand was 

 dry and warm; the moisture was reached in a depth of 15cm, 

 the slope was totally bare of any vegetation. 



Aug. 5'h Аиц. 5'h Aug. S"' 



1,20 p. Ш. 4 p. m. 7 p. m. 



Temperature of the air + 8° С — — 



Temperature of sand, 25 cm depth + 8°,6 C. 9°,4 С 9°,б С. 



— - — 35— — + 8°,4C. S°,iC. 8°,7C. 



Thermometer with blank ball, just covered 



by loose sand + 35° С — - 



In moist sand in small cleft at foot of 



sandy slope, in 4 cm depth + 8° C. -- — ^. 



') The bush was not very distant and had the same exposition. 



