240 Proceedings of the Royal Physical Society. 



Summary. 



1. In a semi-discharged nematocyst, when fresh, the true end of the 

 filament is concealed from view, and in consequence its structure cannot be 

 ascertained. 



2. When the process of eversion is complete, the fluid contents are 

 expelled from the end of the filament, which, presumably, at this time opens 

 freely to the exterior. 



3. A resting nematocyst is over-distended and in a state of tension. 



4. Experiments with flexible tubes are useful for illustrating in detail the 

 process of eversion. 



[ Issued separately, 25th January 1912. 



