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 Linné smoothed the way to the study of 
Natural History ;—having therefore led you through a 
large portion of the flowery 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?: I shali 
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 Orzsmelogy®, 
may be divided into ‘wo branches—General Orismology, 
and Partial Orismology ; the first containing general de- 
finitions, and the last those relating to particular parts 
and organs. 
* Vor. III. p. 354—. > Ibid. p, 529, 
VOL, IV. S 
