180 BELL SYSTEM TECHNICAL JOURNAL 



nounced excess (kurtosis), where c^ is large as compared with t's, it 

 seems also reasonable that 



F{x) = coipoiz) + Ci^i{z) 



might in certain instances give as good a fit as 



F{x) = coipo(z) + r3<^3(s) + Cicpiiz) + ^fsVeCz). 



These aspects of the series have been discussed by Thiele. 



Arne Fisher. 



January 10, 1927. 



