78 
ME. A. CAYLEY’S SIXTH IMEMOIE ETON QrAXTICS. 
Itself, consideied ^ a pom ot considered as belonging to the 
the sibiconjuga e riang ■ . ^ considered as belonging to 
sibiconjngate triangle and such pair of cor-respondmg pom s, I" “ sTthe tno 
coincides with itself, considered as belonging to the second figme. But 
further discussion of the theory of homography for another 
198 Sunnose secondly, that in the foregoing general theory, 
198. buppose, seconay, therefore order and class, signify pomt and ii»c. 
srwrrrtt— 7. -p-;/, * ;f. •” 7 : 
r r ."Ai. » . 
order and class, and its ineunts and tangents, 
the tangents and ineunts of developments, we may assume that the 
. .'.17 I. ad. .« a. p">“ 
"is;. ba..« » a. •« p. ». ««””• - mu 
lines in the second or first figure, generate a conic which 'W ^e to 
and the lines which, considered indifferently as belonging o . envelope a conic 
pass through the corresponding points in the second or hrs 
which may be termed the ^ another o'ccasion; 
nnnHipr The further consideration of this subject is les 
but I remark that in the particular case where the two “““ 
ordinary theory of poles and polars in regard to a conic a ^ 
point of view, may be considered as arising out of tl 
“'^l'!“conL”e°Tconic and a point : any line through the point meets the conic in two 
