628 GASES PRESENT IN FLOATS OF CERTAIN MARINE ALGvE, 



The water was wave-water taken off the shoie at Bondi, on the 

 ocean beach. 250 c.c. of sea- water yielded 3-65 c.c. of gas, or at 

 the rate of 14'6c.c. per Htre. The "Challenger" average was 

 15 c.c. 



Another analysis of Coogee ocean-water gave — 

 III 100 vols, of sea-water gas 



Nitrogen 58-33 



Oxygen 30'55 



CO^ nil 



99-99 



This is almost identical with a "Challenger" analysis. 



The following is a Table of the analyses of the gases of the floats 



of some of our algae. 



The analyses disappointed me, for I, perhaps unreasonably, 

 hoped for nearly uniform results. With the exception of the 

 last, however, it will be seen that in all the proportion of oxygen 

 is less, usually much less, than if air had been taken directly into 

 the cavity, and in all the proportion is notably less than in air 

 dissolved in water. 



The proportion of oxygen being then less than in ordinary air, 

 and much less than in water-dissolved air, it would seem that the 

 plants, however they may obtain the gas, use up some of the 

 oxygen, sometimes a good deal, for other purposes than levitation. 



