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Fig. 5. Normal young Componu/or/o section. Magnification 500X. 



Fig. 6. Regressing Campanularia hydranth. Magnification^SOOX. 



species? Might it be the activation of lysosomes? In order to test this 

 thesis, we have compared H. littoralis of the Loomis strain with 

 Campanularia for the presence and distribution of acid phosphatase 

 f>ositive granules. This is one of the simplest ways to localize pre- 

 sumptive lysosomes (13). Acid phosphatase is one of the enzymes 

 which lysosomes generally contain. 



Figure 7 illustrates a young Campanularia, stained for acid 



