class of Organic Impressions^ tffr. SS5 



the insect appears to have emigrated, and after working for itself a 

 lateral passage to a sufficient distance, to have formed a new settle- 

 ment In the midst of fresh supplies. In the recent oyster shell which 

 I have transmitted, you will perceive that this process has been car- 

 ried on to a great extent, in the intermedial matter between two or 

 three sets of the pearly plates comprising it ; and yet without effecting 

 the destruction of the exterior crust, or in any degree injuring the 

 inner surface of the shell, which remains untouched, and, notwith- 

 standing these attacks, still equally adapted to every purpose required 

 by the oeconomy of its Inhabitant. 



