Whewell, WilliamCONIC SECTIONS: Their Principal Properties Proved Geometrically Cambridge J. and J. J. Deighton 1846 Octavo, Printed Wrappers, iv+43p. , Poor Condition Disbound (showing thread holes) . Front Wrapper lacking a 1" x 5" portion at the left margin. Forward extremities rounded. ; A very brittle copy which would best be kept in a box or under a glass exhibition case. VERY RARE! !