Il6 KANSAS UNIVKRSIJV (,)UARTERI.V. 



asAA^', A'Aj are the tangents to the so-called conic of tlic trans- 

 formation which, in this case, is a hyperbola having I and I^ as its 

 vertices. The same is true of the ra3\s connecting A and B,', A' 

 and Bj; they are the tangents to the conic of the elliptic involution. 

 This conic is also a hyperbola and, like the hyperbola of the 

 hyperbolic involution, has the raN's J and J' as asymptotes. It has 

 the chords of the circle with II j as a diameter included by the rays 

 J and J' and parallel to II ^ as tangents at the vertices. 



