INTRODUCTION. V 



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 number 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 

 Lepadesin groups, having tentacula a 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- 



