90 ETON NATURE-STUDY 



SUGGESTIONS FOR FURTHER WORK IN SCHOOL 



The way in which snails feed should be watched, and if a young 

 specimen is held to the light, the movements of the organ which 

 perforates the leaves when the creature feeds may be seen through 

 the semi-transparent body. In thin-shelled examples, and in smaller 

 species, it is possible also, on looking at the underside of the shell 

 when the animal has retired within, to make out the beatings of the 

 heart. It will not be amiss to have a few empty shells at hand, and 

 the whorls of some should be broken away so that the spiral chamber 

 can be followed. 



