ADVERTISEMENT. 



lie, have induced him to believe he, may ftill be ufeful, 

 and though he cannot, confiftently with the conditions 

 of this undertaking, extend it further at this time, iliould 

 a fufiicient number of new and valuable fpecies occur, he 

 will certainly be tempted to tranfgrefs, and make fome 

 addition to the prefent fele6tion. 



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