INTERNAL ANATOMY OF INSECTS. 95 
of the body,—these are the arteries. Before it enters 
the tail, the heart throws out two vascular branches 
which do not go to the gills, but distributing the blood 
to different parts, ought to be considered as arteries. 
Treviranus mentions bunches of reticulated vessels, con- 
cerning the use and origin of which he seems uncertain > ; 
but as they approach the gills, they are probably the 
branching extremities of what M. de Serres considers 
as the veins. 
® N. Dict. d’ Hist, Nat. xxx. 420. Comp. Treviran. Arachnid. 10—. 
> Ibid. 9—. 
