A CLASSIFICATION OF GROUPS 317 



(Continued.) 

 84* 80* 89* 



27 + 57 15 + 50+15 39 + 50 



33~T 24 33 + 33/2 33 + 33/2 



60* 169* 49* 



33 + 27 80 + 89 33 + 33/2 

 15 + 50 + 15 50 + 39 



39* 54* 240* 



39 +15 80 + 80 + 80 



27 + 27 60 + 60 + 60 + 60 



89 + 54 + 49 + 48 



The examples cited above seem to indicate that there exists 

 a quasi-stability in the order or succession in which groups are 

 beat at different times, which is manifested in the fact that 

 groups which have the same or about the same place in the 

 temporal order of the series with respect to a group common 

 to the several records can be expressed in terms of each other, 

 or in terms of common groups, or by the sum of two or more 

 groups of the same set, or by the sum of two or more groups of 

 different but neighboring sets. This may be perhaps inter- 

 preted that the above relations merely express the simple fact 

 that an observer like S beats several typical groups of the 

 order a Jt a 2 , e B} a 4 , etc., and their many combinations, and tends 

 to beat them from day to day without their suffering any radical 

 modifications of any kind, whether from environmental causes 

 or internal causes, thereby giving to these series of groups the 

 appearance of associations akin to the associations of the sub- 

 jective field, and doubtless of the same kind. Thus the several 

 different series, oriented with respect to a common group, may 

 be regarded as a number of different modifications which one of 

 them, or an entirely different one have from time to time suf- 

 fered from various causes. Genetically there are several inter- 

 esting problems contained herein which are capable of experi- 

 mental treatment, but which the writer will defer for later 

 consideration. 



