9 6 



BOTANICAL GAZETTE 



[FEBRUARY 



than on other formations of the sand strand, because of the frequent 

 inundations and subsequent changes in evaporation. It is generally 

 low as compared with that on the higher parts of the beach. Seven 

 measurements taken at Hogsar, Nagu, Finnish Archipelago, in June, 

 1894, averaged 16? 4 at a depth of 2 cm . The corresponding data, 



obtained at varying depths, are shown by Table I. 



TABLE I 



1 

 2 



3 

 4 



5 

 6 



7 











Sea 



water 



1 



Wind velo- 



2 cm. 



5 cm. 



10 cm. 



Air 



Time 



city, m. per 











WW v« v vl 





sec. 



18.3 



16.3 



17.4 



19.6 



... 



18.4 



12:30 P. M. 



i-5 



14.9 



x 5-5 ! 



16.3 



13.8 



16.6 



2 : OO P. M. 



0.5 



19.6 



18.9 



18.6 



19.8 



16.7 



II 130 A. M. 



4.1 



16.5 



15.8 



15-9 



16.5 



16.9 



2:00 P. M. 



o-3 



14.2 



14.6 



15-2 



14.4 



16.5 



1 : 30 P. M. 



2.6 



I 3 3 



13.6 



12.9 



14.0 



15.6 



i : 20 p. M. 



1.8 



16.7 



x 5-4 



14.7 



16.9 



16.5 



2 : OO P. M. 



• 



0.4 



Cloudiness 

 1-10 



2 



6 



4 

 



i-5 



2 



with 



In all cases except 3 the sand was covered with vegetation, in 5 and 7 

 Glanx maritima, in 2 with Erythraea litoralis, in 1 and 4 with Argentina anserim 

 and in 6 with Triglochin maritimum and Eleocharis uniglumis. 



In September, 1902 



measurements 



front beach at Freemantle, Western Australia. No vegetation 

 occurred on the formation. The following results were obtained 

 (Table II) : 



TABLE II 





2 cm. 



I 



32.6 



2.. . . 



37-4 



3... 



26.2 



4-... 



25 -4 



$-... 



21.3 



5 cm. 



10 cm. 



25-4 

 28.7 



19.2 



20.4 



15.6 



22.9 

 27.1 

 17.4 



18. s 

 14.2 



20 cm. 



Air 



20.2 

 24.9 



15.6 

 15.8 

 13.6 



Sea 

 water 



Time 



26.4 



30I 



2 7-5 

 24.4 



22.7 



J 3-4 

 14.6 



12.9 



I2 -5 

 12.8 



9:00 A. M. 



IIOO P. M. 



2 : OO P. M. 

 IH30 A. M. 

 12 .15 P. M. 



Wind velo- 

 city, m. per 

 sec. 



2 

 2 



1.5 



0.3 



3-5 



Cloudiness 

 1-10 



I 

 1-5 



3 

 6 



4 



The average temperature of these five series at 2 



.On _ *-» >» . . . 



cm 



depth 



is 



mean 

 much 



thus 



series 



while the atmo 



pheric temperature was considerably higher. 



Of sixty measurements taken in day time on the front beach under 

 conditions as similar as possible, the highest temperature obtained for 



