83 



Fig. io. 



Graph showing the Q*yc«n consumption of Fertilised 

 •g$a of Stron^ylooentrotus p urpuratus in increasing 

 oonoent rat ions of BaOH. Orlin&ts * co. 0.1& HaOH in 

 50 oo. of the solution. Ab»oies& * ooeffioi«nt of 

 Oxygon consumed as ooapared to neutral oontrole. 

 Drawn from the iat» of Loeb and Vastneya (1913 b) 



