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. 
3 N.Bict. cV Hist. Nat. xxx. 420. Comp.Treviran. Arachnid. 10 — . 
b Ibid. 9—. 
