26 GEOEGE JOHN EOMANES i875- 



The organism thus mutilated responds with a 

 single contraction to a nip with the forceps, also to 

 various chemical stimuli. The chain of ganglia do 

 the same, and further resemble the mutilated organism 

 in contracting once to both make and break of direct 

 or of induced shock. They differ, however, in one 

 important particular : the severed margin retains its 

 sensibility to the induced shock much longer than to 

 the direct, while with the necto-calyx the converse 

 is the case — the latter responding vigorously to make 

 and break of direct current after it has ceased to be 

 affected by even interrupted current with secondary 

 coil pushed up to zero (one cell). 



A strange and, so far as I am aware, an unparalleled 

 phenomenon is sometimes manifested by Sarsia after 

 removal of ganglia. It only happens in about one 

 case out of ten, and never except in response to either 

 chemical or electrical stimulation. A bell quite 

 paralysed, and which may have responded normally 

 enough to stimulation for a number of times, sud- 

 denly begins an active shivering motion, which may 

 last from a minute to half an hour. This motion is 

 totally different from anything exhibited by the 

 animal when alive, and after ceasing never recom- 

 mences without fresh stimulation. The shivering 

 appearance, I think, is due to the various systems of 

 muscles contracting without co-ordination, but why 

 it should take place in some cases and not in others, 

 I am quite unable to determine. 



Irritability of bell to shocks increases progres- 

 sively from centre to circumference, and is greatest 

 when electrodes are placed on marginal canal. Also 



