534 PROCESSES INFERRED FROM INDIRECT OBSERVATION 



in velocity with time, would have to be polymolecular, i. e., involve a 

 large number of simultaneously reacting molecules, and polymolecular 

 reactions do not actually occur, or rather they take place in successive 

 monomolecular, bimolecular or trimolecular stages. 



Tim e in 6-46 hou r units 



FIG. 47. Curves illustrating the analogies between the fading of a memory trace, 

 the extraction of protamine from spermatozoa by acid and the dissolution of dried 

 casein by dilute alkali. 



If, however, we compare the curve of forgetting with the curve which 

 expresses the rate of issuance of a colloid (or possibly of a crystalloid) 

 from a colloidal into a fluid menstruum, we cannot fail to recognize 



