De IchRuut, Stewart &Loewy Fhsl. Trans MD CCCIiXIX . Elate I . 
k.Showiruf the. observations oaths absolute length. of six. bines, meascu'-ecL at different oUstanuss from the centre 
/ 
/ 
/ 
\ 
11 ?^ 
r\ 
\\ 2 
===== 
gr 
/ 
\j 
~ 
/ 
_/ 
