136 GRAMMAR OF ENTOMOLOGY. 



507. Muscles in insects more frequently cross 

 and intersect each other than in vertebrated 

 animals : in some instances, where connected with 

 the organs of respiration and circulation, they are 

 excessively minute, and appear actually inter- 

 woven, crossing in every direction, like multitudes 

 of slender threads. 



508. It is in such situation that dominant 

 motion exists ; motion altogether independent of, 

 and uninfluenced by, the will. 



509. The principal muscles in insects are gene- 

 rally in pairs ; that is, each principal muscle has 

 an antagonist muscle, which, after any given 

 movement, has the power to restore the original 

 position. 



510. The muscles destined for the government 

 of the limbs, are all of the linear or cylindrical 

 form, and all in pairs, a flexor and extensor 

 muscle being found in each joint of the legs, &c. 



