NEUROHUMORS 



51 



Fig. 36. Left side of the trunk of a smooth dogfish, Muslelus, 

 in the region of the anterior dorsal fin showing a secondary light 

 spot due to an injection of 0.5 cc. of an emulsion of olive-oil 

 extract of blanched fins and seawater made a little over a day 

 previously. Parker, Jour. Gen. Physiol., 1935, 18, 840, fig. 1 A. 



Fig. 37. Right side of the same fish as is illustrated in Fig. 36 

 showing no change of color after the injection of 0.5 cc. of an 

 emulsion of olive-oil and seawater. Parker, Jour. Gen. Physiol., 

 1935, 18, 840, fig. 1 B. 



