94 LECTURE IX. 



this subject from an author, who, though he cannot 

 be supposed to have deeply investigated the anar 

 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 lectu- 

 larius, Mr. Baker says : " In the legs of these in- 

 sects, 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? 

 Jation of the blood as briskly as ever." Mr. 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 



