438 



LESLIE B. AREY 



iiHMits, or wcic influenced by their observations on the more 

 strikingly mobile cone (figs. 1 and 2; my. con.), the movements 

 of wliich are the reverse of those exhibited (such is my beUef) 

 by mobile rods in general. 



In recent papers ('15; '16) the writer favored the anomalous 

 photomechanical responses of the frog's rod, reported by the 

 several older workers, as being more trustworthy than the some- 

 what confusing account of Lederer'' ('08). The writer ('15), 



TABLE 2 

 Measuremefds from Lwenly-three light-adapted retinas of Raiia pipiens. The 

 values are in micra and represent measurements taken along axes coinciding 

 with radii of the eyeball. Each value for the length of the rod rod myoid is the 

 mean obtained from twenty consecutively-placed elements 



3 Lederer s figures of isolated rods do not necessarily show how long he rod 

 myoid really was, either in darkness or in light. Presumably, the myoid, as 

 the result of teasing, broke approximately at the level of the external limiting 



