INTERNAL ANATOMY OF INSECTS. 101 



to different parts, ought to be considered as arteries a . 

 Treviranus mentions bunches of reticulated vessels, con- 

 cerning the use and origin of which he seems uncertain b ; 

 but as they approach the gills they are probably the 

 branching extremities of what M. de Serres considers 

 as the veins. 



I am, &c. 



* N. Diet. d*Hist. Nat. xxx. 420. Comp.Treviran. Arachnid. 10. 



* Ibid. 9. 



