412 HARRY THOMAS FOLGER. 



5. After a response to light time must be allowed for recovery 

 before the amoeba will react to mechanical shock and vice versa. 



6. The effect of one kind of stimulus upon a response to an- 

 other kind leads one to infer that the processes occurring during 

 the refractory periods following the reactions caused by mechani- 

 cal shock and by sudden illumination are basically the same. 



LITERATURE CITED. 



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 Folger, H. T. 



'25 A Quantitative Study of the Reactions to Light in Amoeba. 



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Amoeba. Jour. Morph, and Physiol., Vol. 42, pp. 359-37- 

 Hecht, S. 



'18 The Photic Sensitivity of dona intestinalis. Jour. Gen. Physiol., 



Vol. i, pp. 147-166. 

 '19 Sensory Equilibrium and Dark Adaptation in Mya arenaria. 



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'07 Light Reactions in the Lower Organisms. II. Voh'o.v. Jour. 

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