LETTER XLVI. 



ORISMOLOGY, OR EXPLANATION OF 

 TERMS. 



IT was by the language of terms that he invented and 

 employed, as well as by his system and methods of ar- 

 rangement, that Linne smoothed the way to the study of 

 Natural History ; having therefore led you through a 

 large portion of thejlowery fields of the Science of Ento- 

 mology, I must now conduct you into that arid but not 

 barren or unprofitable region. To enable you to under- 

 stand descriptions of insects, or to describe them your- 

 self, you must have a knowledge of the technical lan- 

 guage by which their parts and characters are expressed. 

 Much of this you already know from the definitions of 

 external parts, furnished in a former letter a : I shall 

 now give you a more full and general explanation of 

 terms, adding many new ones for unnoticed characters, 

 that may be conveniently employed. 



The science of terms, which I shall call Orismology b 9 

 may be divided into two branches General Orismology, 

 and Partial Orismology; the first containing general de- 

 finitions, and the last those relating to particular parts 

 and organs. 



* VOL. III. p. 353-. " Ibid. p. 527. 



