390 



pliarostonia frichophylluni, Anthelia julacea, Martinella Bart- 

 Hugii, Aplozia fiphærocarpa v. iurida, Jungermannia quinque- 

 dentata, J. ventricosa and ./. inflata. 



North of tilis 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 5*'^ of August at noon. 



Black ball . 

 Green ball . 

 5 cm deep . 

 55 cm deep 

 The air 



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 Au^. ô"» Aug. 8"» 



1,20 p. m. 4 p. m. 7 p. m. 



Temperature of the air -4- 8° C — — 



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



_ . _ 35 _ _ -u 8°,4C. 8°,iC. 8°,7C. 



Thermometer with blank ball, just covered 



by loose sand -{- 35° C. — - 



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. 



