156 



Royal Society : — 



& 



s 



£ 

 V 



Theoretical 

 ratio 



by calcula- 

 tion. 



ocdk in,«g iniQwnnnN n « ~ — 



CO 



General 

 mean by 

 observa- 

 tions. 



q oo oo in. to io «: ^ f v p: x, o im - o « r. m 



*■" 



a 



« 



3 'O fl PI iM a) N flO J! -O Jl « Ol^C 



© co oo oo tNtc Dio^tfTtnn(M-.HM 



O irj 



■"« 



<\ 



ooxis-nto« o — in. to ?i t ^ in, oo 



C CO IN.CO tOtO«0«i-<J'-*i , COCOCO(N • ■>) —i 



— CO 



M — 



— 





A 



-1 



o -* 









rt 





< 



oim-Knoooo oo -o co co co co 



OfflOl tN.tO to iO -* • t CO CO -IN -SNCN • • 



—i 



> 



o 



« 



o -- in,co 



o • • oo to *n 





—. 





<5 



O Ol00 lN.tO irj OOlfllNIONO o> 

 C00KIOKN • tC -* ^f t}< CO (N CN • •© • ■ 



— 



6 



m 



O CO ©0©tO©tOlN,0 tN, 



© • In. • In.O to ^f -* CO -t <N • • -* • • • • 



_ 



< 



O CO "0 . 00 CO © (O CO H to to 

 © • ' iTMf) |Tf ■* f • CO CM CO • • <N <-" 



• 2 



—• 



O 



CQ 



O NtO OO -<* COCO 



ooocc • • to to • • • -co • • in -h ; ; • 



—■ 



< 



o oo co aa tN. 

 o m • • • co * • • cs -< 





r-< 



3 



3 

 < 



« 



O <N C> CO <N — CO CO 

 o • • • 'to >o • • " 'COCO • <N »- -h 



. "° 



— 



<5 



O 00C0OC1 O — ' ov-o 



P ! ! I i *P V 1 'P ° ' ; w I T 3 I ?• 7* I * 



'B 



w 



o cj io o o n a n tc io ■* 

 o • • • t>.to to • • • ^f n in tM ~ - -. 



2 2; 



— 



<i 



o t^to oo o> 





•-I 



c 



3 



>-5 



•3 



o cj i.o — ■ >o co r^ 05to -e to 













© © in «# t© In. CO 



© iC-S-COCO'COCO*". 





-H 







m 



© In. 



© • ■ • -to 





— < 





< 



c o.tJi or: t into in. 



ototo© -r io m ^* tji -co 





r- 





< 

 a 



H 



©© — coco — coco 



OONUD IN In. to to 



— 



< 











_l 





° , . cs . .5 . 





- 



" " 



<i 



|©o oo" io 









1 — 





,0 



w" 



' © m ■* to 









— . 





< 



© CO to j 





— 



•-5 



« 



© CO O CO 





—> 



<i 



© uO CO O X CO >o CO 





-H 



'3 















. -g ............ ,->.„_„„, 



. - 



^©©©©©OOOOOOOOOO© 



ooooooo^oc:©^©©©©© 

 •.-ceooooocooococcc: 



© © 



O O 

 © © 



^ ci co •# o to' i>. cc di o — i ci co -+' io to" In 



cc o> 







CO — 



<~* o" 



.2 o 

 ,3 



o -j 





o 2 

 o "43 



