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Puget Sound Marine Sta. Pub. 



Vol. 1, No. 14 



When acid was added to the animals (table 7) they lost equilibrium 

 in a short time. The length of time to lose equilibrium was clearly cor- 

 related with the depth from which they came, but the relation is reversed 

 as compared with the results from fresh water and temperature. The 

 animals which came from the greater depths lost equilibrium later than 

 those from the shallower water. 



Table 8 shows the relations to alkaline water. Here again the species 

 from the greater depth showed the greater resistance to the alkali. 



Table 8. Showing the resistance of animals from differenth depths, to 



alkalinity. 



*Decidedly alkaline to phenolphthalein; not titrated. 

 **Maximum depth recorded outside of Puget Sound. 

 ***Green, from locality B, eelgrass. 



