INTRODUCTION. Vv 
coast of Africa:—He attached a piece of wood, 
as a buoy, to an anchor, and perceived that in 
a few days it was covered with a slimy sub- 
stance, which shortly after became green; and, 
in less than a fortnight, a nuniber of minute 
barnacles appeared, which daily increased in 
size, and in the course of six weeks exceeded 
an inch in length. Pieces of wood are fre- 
quently taken up at sea entirely covered with 
Lepades in groups, having tentaculaa foot long, 
and of a beautiful bright pink color, accompa- 
nied by muscles in great abundance. This 
seems to prove that the barnacle exists in the 
sea, in the state of animalcule. 
LIMPETS may be found in all parts of the 
world, adhering to rocks, wreck, &c. &c.— 
In many places the sea seldom ebbs without 
leaving shells of various species: among the 
most common that are exposed for sale in the 
markets of the countries the traveller may-vi- 
