The Roman figures denote the stage of resorption at a parti- 

 cular time in a solution of given strength. All solutions up to 

 N/32,000 are too strong and kill the organisms before any 

 resorption occurs : in the N/B2,000 solution resorption pro- 

 ceeded a little way but the organisms were then overcome by 

 the poison. 



It soon became apparent that the preparations used were not 

 wholly satisfactory, for of the eight zooids borne by the colonies 

 all had not been resorbed to the same exter.t at the same time. 

 To meet this difficulty portions of the hydrocaulus were used 

 bearing only one well-expanded zooid. 



Table II (ObeUa). 



The results of this experiment were much more definite, 

 but the solutions used were still too strong. 



