264 RELATION OF DECREMENTS TO 



Intermediary decrements on the acute solid angle at E. 



These are of four kinds, and require four general 

 symbols. 



Class o is represented by (B P d' q D q B'r). 

 Class p ...... (Dp B' q D q d'r). 



Class r . . (Bp D q d'r B's : B P d' q I) r BV). 

 Class rWj . (Dp B' q Br d's : D P B'r B q d's). 



i 



Simple and mixed decrements on the angle 1 at the base. 

 General symbol p l p . 



If p ~ 1, the symbol represents mod. g. 

 p ^> 1, . . ..... class k. 



Intermediary decrements on the obtuse solid angle at I. 



These are of four kinds, and require four general 

 symbols. 



Class h is represented by (C P D q D' q C'r). 

 Class i . ..... (Dp C q C'q D'r). 



Class I . . (C P D q D'r jC ; s : C P D' q Dr C's). 

 Class m . . (Dp C q C'r D's : D P C' q Cr D' s ). 



Decrements on the acute terminal edges. 

 General symbol P B P . 



If p 1, the symbol represents mod. v. 

 p ^> I, ....... class x. 



Decrements on the obtuse terminal edges. 

 General symbol P C P . 



1 ? the symbol represents mod. t. 

 p ^> 1, ....... class u. 



Decrements on the edges of the base. 



P 



General symbol D. 

 p 

 If p 1, the symbol represents mod. y. 



p ^> 1, ....... class z. 



