6840 



Appendix 



7640 



Parallel to inaccessible line, tracing. Ftpoux, 

 0. A. Cond. Pon. Chauss. 33 (1889) 632-. 



Poncelet's geometrical interpretation of v-X 

 Ghibaldan, I. Bucarest Ac. Eom. A. 17 

 (1894-95) (Ft. Admin.) 639-. 



Quadrics, perspective contours for, new con- 

 struction. Zipernovszky, K. Wien Ak. Sb. 

 71 (1875) (Ab. 2) 33-. 



Practical Solid Geometry. 



Illumination-constructions for surfaces whose 



sections perpendicular to one axis are similar 



ellipses. Niemtschik, B. Wien Sb. 57 (1868) 



(Ab. 2) 678-. 

 Intersection of surfaces of revolution. [Schiappa] 



Monteiro, A. G. Teix. J. Sc. 1 (1878) 177-. 

 Quarter cones (in breakwaters), drawing. 



Lanave, L. A. Cond. Pon. Chauss. 36 



(1892) 17-, 33-. 

 Shadow, and parallel projection generally, of 



screw surfaces. Burmester, L. Z. Mth. Ps. 



18 (1873) 184-. 

 tracing. Anon. A. Cond. Pon. Chauss. 



38 (1894) 415-, 434-. 



Projective Geometry. 



Theorem of Schlomilch, demonstration. 



Quidde, A. Z. Mth. Ps. 28 (1883) 192. 

 and desmic systems of 3 tetrahedra. 



Schroeter, H. E. Z. Mth. Ps. 28 (1883) 



178-. 



7210 



De Morgan, A. Camb. Mth. J. 2 (1841) 202-. 

 Axes of conies as central projections of circle. 



Pelz, C. Prag Sb. (1872) 32-. 

 Construction from points, general method. 



Azzarelli, M. Em. N. Line. At. 30 (1877) 64-. 

 Eccentric anomaly and conies. O'Brien, M. 



Camb. Mth. J. 4 (1845) 99-. 



Ellipses. 



Focal property of ellipse and hyperbola. Earn- 



shaw, S. [Signed F.] (vi Adds.) Camb. 



Mth. J. 3 (1843) 196-. 

 Maximum in- ellipse. Caluso, (I'abbe) T. V. de. 



Turin Mm. Ac. 6 (1792-1800) 213-. 

 3 properties of ellipse and hyperbola deduced 



from property of circle. Pollock, (Sir) F. 



E. S. P. 4 (1843) 443-. 



Envelope of chord subtending given angle at 

 focus. Booth, J. Camb. Mth. J. 3 (1843) 

 87-. 



Foci. 



Foci, directrices and eccentricities, quadruples 

 nature. Mitchell, O. H. (xn) J. H. Un. 

 Cir. [2] (1883) 144. 



Pascal's hexagram, Brianchon's hexagon, 

 and connected figures. 



Pascal's theorem, analogues, extension to 

 curves on surfaces. Folie, F. Brux. Ac. 

 Bll. 37 (1874) 811-. 



Quadrilaterals, Quadrangles, and related 

 Conies. 



Circum - quadrilaterals, Newton's theorem, 

 demonstration. Terquem, O. N. A. Mth. 

 2 (1843) 378-. 



In-quadrilateral, Newton's theorem, generalisa- 

 tion. Faure, H. N. A. Mth. 17 (1858) 368-. 



Triangles, and related Conies. 



Conjugate triangle of 2 conies. Cassani, P. 



G. Mt. 8 (1870) 200-. 

 Triangle and conic touching sides, solution of 



question of Cayley's. Jonquieres, E. de. 



N. A. Mth. 16 (1857) 189-. 



7230 



"Conchordal" conies, system. Story, W. E. 

 [1881] (xn) J. H. Un. Cir. [1] (1882) 178. 



Conies with Common Focus or Foci. 



Confocal conies, etc. Bellavitis, G. Ven. At. 

 (1859-60) 821-. 



Special connex (2, 2). Amodeo, F. G. Mt. 

 25 (1887) 321-. 



7240 



Double contact, 2 problems by Salmon, exten- 

 sion to surfaces. Anon, (xi 29) G. Mt. 

 7 (1869) 254-. 



Ellipsoid. 



as deformation of sphere. Blazek, G. Prag 

 Sb. (1869) (pt. 2) 29-. 



7610 



Singular points. Chasles, M. C. E. 59 (1864) 



209-. 



. Halphen, G. H. C. E. 78 (1874) 1105-. 



. Tichomandrickij.M.A. Kharkov Mth. 



S. Com. 2 (1891) 114- ; Fschr. Mth. (1891) 



757. 

 Singularities of curve, relation. Klein, C. F. 



Erlang. Ps. Md. S. Sb. 8 (1876) 95-; Mth. A. 

 10 (1876) 199-. 

 curves. Zeuthen, H. G. Mth. A. 10 



(1876) 210-. 

 , compound. Guccia, G. B. Palermo 



Cir. Mt. Ed. 3 (1889) 241-. 

 , nature and effect. Scott, (Miss) C. A. 



Am. J. Mth. 15 (1893) 221-. 



7630 



Triangular potential curve. Cesdro, E. N. A. 

 Mth. 7 (1888) 257-. 



7640 



Singularities relating to multiple line of sur- 

 t&ce. Zeuthen, H. G. Mth. A. 4 (1871) 1-. 



Surface of elasticity, theorem. Strebor 

 [Roberts, W.]. N. A. Mth. 10 (1851) 197-. 



665 



