. LECTURE IX. 
this subject from an author, who, though he cannot 
be supposed to have deeply investigated the ana- 
tomy of insects, was yet an excellent general 
observer, and who detailed with great plainness 
and accuracy his own observations, viz. Mr. Henry 
Baker, the celebrated microscopic observer. In 
speaking of the common Bug or Cimex leetu- 
larius. Air. Baker says : " In the legs of these in- 
sect s^ when very small, the current of the blood 
is remarkably visible, together with an extra- 
ordinary vibration 'of the vessels, which I have 
never observed in any other creature ; and though 
one of these animals has been confined between 
two glasses for many weeks together, so as not to 
be incapable of stirring, and has at times appeared 
dead, yet a little warmth, properly applied, would 
renew the motion of the bowels, and the circu? 
lation of the blood as briskly as ever.” Air. Baker 
also observes that the circulation of the blood 
may be perceived in the wings of Grasshoppers, 
and that the globules of the blood in those animals 
are of a green colour. 
After this general description of the nature of 
insects at large, I shall proceed to a slight survey 
of the several families or divisions into which they 
