9 8 



BOTANICAL GAZETTE 



[FEBRUARY 



A comparison with the results in Tables I, II, and III reveals the 

 fact that, while the surface temperature (2 cm ) in all cases was higher 

 in the series given in Table IV than in Table II, the temperatures at 



5 



cm 



former 



of a more intense evaporation, which caused a corresponding loss of 

 heat. No such difference existed between Tables I and III, where the 

 solar radiation was less, and both the atmospheric and sea-water 

 temperature lower. 



We shall now proceed to a statement of the temperature conditions 

 on the upper beach. Table V gives the results of some observations 



July 



Jerwe on the Oesel Island in the Baltic, m 



The beach has a low grade and is limited landward by a 



hich 



littoral dune in the shape of a steep and high bank, on the top of w 

 small dunes are developed. The sand on the upper beach at the foot 

 of this bank is rather coarse, consisting of a reddish-yellow quartz. 



TABLE V 



I 



2 



■ • 



• • 



2 cm. 



5 cm. 



3 •-. 



22.4 



27.3 

 26.8 



22.8 



26.2 



24.3 



10 cm, 



21 .4 



24.5 



22.8 



20 cm 



Air 



19.6 

 22.7 



21 .1 



Sea 

 water 



21 .6 

 25 .2 

 23.6 



17. 1 

 16.4 

 16. 1 



Time 



10:30 A, M, 

 I : OO P. M. 

 3:15 P.M. 



Wind velo- 

 city, m. per 



I 



2 



Cloudiness 



3 



I 



5 



The next table is a continuation of the measurements given in 

 Tables II and IV from Fremantle, W. Australia, and the general 

 conditions supplied in regard to those tables refer also to these obser- 

 vations on the upper beach, except that the time in each case was about 

 " *"' ' ' The sand was of medium-sized, white-yellow quartz. 



minutes 



mixed with an abundance of shell fragments. 



TABLE VI 



3 

 4 



5 



2 cm 



34-8 



38.9 

 28.8 



27.6 



25-3 



S cm. 



24-5 

 24.9 



19.2 



22.5 



*7-3 



10 cm. 



20 cm. 



22.6 



21 .1 



23-4 



22 .O 



17.6 



16.4 



20.7 



l8.2 



16.9 



145 



50 cm- 



18.3 



19.6 



16.6 

 13.8 



A: 



will be seen, the temperature on this formation does not 



differ 



