302 
ME. A. CAYLEY’S MEMOIE LTOX CAYSTICS. 
increases, but undergoes modifications in its form ; the interior oval in the first instance 
diminishes until we arrive at a curve, in which the interior oval is reduced to a conjugate 
point (see fig. 15) ; then as continues to increase the interior oval reappears (see fig. 16), 
Fig. 15. Fig. 16. 
point (see fig. 17); and as (/j increases still further the curve again breaks up into an 
Fig. 17. 
Fig. 18. 
exterior and an interior oval (see fig. 18); and thenceforward as (jij goes on increasing 
