‘THE SCHOOL OF THE SHORE 25 
habit much for protection, for their thick, 
hard shell covers the gills and prevents 
evaporation; they are sufficiently active to be 
able to get to a pool or a sheltered crevice 
under a rock whenever occasion arises; and 
their strong claws and pugnacious spirit are 
enough to keep off most enemies except still 
bigger crabs. Some of the other members of 
the family, however, such as the burrowing 
prawns, tunnel in the sand near low-tide 
mark, and live an almost underground life. 
THE STRUGGLE OF THE SHORE 
A haunt with a crowded population of all 
sorts and sizes, a haunt where the most con- 
stant thing is change, a haunt bristling with 
difficulties and hemmed in by limitations; 
there is bound to be much struggle on the 
shore. But we should try to make it clear to 
ourselves that the ‘“‘struggle for existence” is 
a technical phrase which includes much more 
than a life-and-death competition around the 
platter, much more than what we get a sym- 
bol of when the pigs elbow and jostle one 
another at the feeding-trough; it includes all 
the answers-back that living creatures make 
