A STORM.—RAZOR FISHES. 141 
grains of sand which it rubs against the rock, 
might be sufficient; the cilia of others are said 
to be used in the boring. But none of these 
seem sufficiently to account for incisions made 
in flinty rocks or hardest of shell-like sub- 
stances. Hence it has been suggested that the 
work may be sometimes slowly but surely ac- 
complished by the means of an acid secreted 
by the bivalve for this purpose. 
“Borers sometimes entirely bury themselves 
in rocky sepulchers of their own excavation. 
“In tombs of men whom the world honors 
hghts are sometimes kept burning. Nature 
honors equally these little miners, to whom 
she has given lamps while living; and after 
their busy days are over, their work done, and 
no man knoweth their sepulchers, still the hight 
of their little lamps may be seen, for these 
borers are luminous; and it is said that the 
Pholas at least retains its phosphorescence so 
long as a piece remains; even if that piece be 
hard and dry it will again give out its light 
when moistened by the waves. 
