EWING : OBSERVATIONS ON ACRIDID^" 319 



injured side, indicating that the flexors of one side and the ex- 

 tensors of the other are affected, and that each half of the brain, 

 though controlling the reflexes of its own side, also exerts to a 

 certain degree a power over the associated muscles of the oppo- 

 site side. 



6. The suboesophageal ganglion is not the center for correla- 

 ted movements in the grasshopper, as Ward found it to be in 

 the crayfish. Since the turn-over, reflex, walking, hopping, 

 flying and alighting persist not only when it is removed, but 

 when the whole head is cut off. The suboesophageal ganglion 

 exerts, however, to a certain degree, an influence over the sense 

 of equilibrium. The preservation of the segmental arrange- 

 ment of the nervous system enables the animals to execute the 

 progressive movements. 



