Microscopical Essays, 



187 



To thefe we may alfo add, that the mechanifm refulting from 

 the life of infects is not of fo compound a nature as in animals 

 of a larger fize. They have lefs variety of organs, though fome 

 of the organs are more multiplied ; and it is by the number and 

 fituation of thefe that their rank in the great fcale of beings is to 

 be determined. 



Thefe characters are often united in the fame infect ; there are, 

 however, fome fpecies in which one or two of them are wanting. 



Every microfcopic obferver, who wifhes to avail himfelf of the 

 difcoveries of other writers, or to communicate intelligibly 

 his own, will find it neceffary to make himfelf mailer of the 

 various claffes, genera, Sec. into which infects have been 

 divided by Linnaeus. All fyftems have their defects, and it is 

 highly probable that this may be the cafe with that of the 

 celebrated Linnaeus : but the purpofe of fcience is anfwered by 

 ufing thofe difcriminations which are generally adopted. 



The following general idea of the Linnsean claffes may ferve as 

 a foundation for this knowledge : a fuller account may be ob- 

 tained by confulting the under-mentioned works. 



Inflitutions of Entomology, a tranflation of Linnaeus's Ordines 

 et Genera Inlectorum, or Syftematic Arrangement of Infects, &c, 

 by Thomas Pattifon Yeats. 



Fundamenta Entomologica, or an Introduction to the Know- 

 ledge of Infects, tranllated from Linnaeus by W. Curtis, author 

 of the Flora Londinenfis, Botanical Magazine, &c. 



Z 2 The 



