BERNARD L. STREHLER 



383 



phosphatase by Gomori's method (24). Note that there is practi- 

 cally no acid phosphatase except in the nuclei, although there is an 

 occasional granule here and there. 



Compare the sparseness of acid phosphatase in the young ani- 

 mal with Figure 8 which shows a ten-day-old hydranth in early 

 stages of regression. Particularly notice the enormous numbers of 

 very small acid phosphatase-positive granules, which are nearly 

 everywhere in the gastrodermal cells. Notice that the tentacles have 





Fig. 9. Electron micrograph of regressing hydranth. Note cytoplasmic 

 disorganization, vacuolization. Magnification about 24,000X. Taken in 

 collaboration with Dr. D. Brandes, Pathology Department, Baltimore City 

 Hospitals. 



