SECTION OF NAKED-EYED MEDUSAE. 129 



ceptibly impaired ; but soon after this stage the 

 intensity of the spasm begins to become less, and 

 later still it assumes a local character. It is im- 

 portant, also, to notice that at this stage the effect 

 of marginal stimulation is ver}^ often that of pro- 

 ducing a general locomotor contraction, and some- 

 times a series of two or three such. During recovery 

 in normal sea-water all these phases occur in 

 reverse order. 



