894 Prof. A. W. Porter on the Inversion- Points for 



I I I I 



CD T— I 



H oo 

 CD t- 



I I 



I I I I 



o IP o o o o o 



CN t- CN 00 00 O CD 



<M ^O OS (M O r-4 00 



O CD CO t~- £~ © -— > 



, 1h 4-t ^-1 r^H 4h ^- CT 



00 O 00 O OJ t- CO 



01 00 — i iC CO CO ;$ 



CN iO i-O CO O CO 



,-h i— I i—i t— i CN CN 



I I I I I I 



o 



PQ 



o 



PQ 

 < 



IIIS 



a °° 



^ en 



I I I i co ou 



I I I I I S £ 



O iO 



^f O 



i— i XQ 



CO CO 



Tin co 

 co co 



CN CO 



I I 



lOiOOOOiOOiOiOiOOOO 

 ^rHOOSOOi-i-^OOCOOOCOCO 

 §00'-<COt-©COCO©COl'-i-llQCO 



^oicocpcp^-^^'f'oocoi^cp 



ol COOOOSi— I CN CO IO r-H CO "<+> CN © 



JT, CO^OOCOCOJt^l-iQCNICOr^CO 



v I O i— iCOTtiCOt-COOsOi-ii— iCOCM 



I 111111177777 





o 



o 



OJ 



OS 



CO 



no 



Ol 



CN 



o o 



OS OS 



CO --H 



CN CO 



"O O 



co o 

 io os 



I I 



OS CO 

 CO OS 



co co 



os r~ 



t- i-t 



I + 



O lO 



CO OS 



t— OS 



© 9 



8 



2 5 3 

 I I i 



. !3 



"O 



01 't- 



co fr- 

 ee CO 



X © 



<] ! 

 »■ i 



I I 



I I 



CO *-• 



r}H 00 



i-i <M 



+ + 



CO r-H 



os co 



CM © 



rl CO 





© 



iO 



© 



© 



£ 



IQ 



© 



© 



© 



© 



vO 



tc 



© 





CO 







id 





rf( 



CO 



CO 



CD 



00 



t- 



CO 





Ol 



b- 







© 



CN 



iO 



CO 



1— 1 



o 



© 



£2 





CO 



S4h 



b- 



b- 



l^- 



00 



CO 



CO 



© 



© 



© 



© 



CN 



iQ 

























r— i 



-H 



i—i 





