liii 
PAGE 
540 
548 
wo quadric 
550 
551 
CLASSIFICATION. 
rry of con- 
556 
Geometry : 
Conics, 500, 541, 552 
558 
Mechanical description of curves, 504, 506, 507, 509, 513 
Bicursal curves, 510 
564 
Penultimate forms of curves, 515, 516, 544 
In-and-circumscribed figures, 489, 514 
Evolutes and parallel curves, 493 
tion for the 
565 
Quadric surfaces, 495, 498, 550 
Centro-surface of ellipsoid, 520 
nunications to 
Cubic surfaces, 521 
Quartic surfaces, 487, 491 
569 
Envelopes, 535 
Curve and torse, 499, 540 
Curves of curvature on surfaces, 502, 505, 517 
vii 
Geodesics on quadrics, 508, 511 
. . .. ix 
ley . . xlv 
. Frontispiece 
Correspondence, transformation, and deficiency of surfaces, 512, 523, 524 
Cones satisfying six conditions, 503 
/ Orthogonal surfaces, 518, 519 
Surface of eighth order, 526 
Non-Euclidian geometry, 528 
Listing’s theorem, 548 
Miscellaneous geometry, 488, 555