7650 



Singular points and planes. Caporali, E. 



Km. R. Ac. Line. Mm. 2 (1878) 791-. 

 Skew hexagon and Rummer's surface. Geiser, 



C. F. Ziir. Vjschr. 41 (1896) (Festschr., Th. 



2) 24-. 

 16 straight lines of surface connected with 



Rummer's lines. Sucharda, A. Casopis 15 



(1886) 149- ; Fschr. Mth. (1886) 769-. 

 Surface with 9 portions, note. Klein, C. F. 



Mth. A. 18 (1881) 160. 



S of 6th degree connected with Rummer's 

 surface. Humbert, G. C. E. 120 (1895) 

 365-, 425-. 



, relation to Rummer's surface 



and curves of 4th class. Humbert, G. C. E. 

 120 (1895) 863-. 



Systems through lemniscate. Schjerning, W. 



Arch. Mth. Ps. 7 (1889) 113-. 

 Tetrahedroid, equation. Hofmann, F. Crelle 



J. Mth. 98 (1885) 264. 

 , note. Hutchinson, J. I. N. Y. Am. Mth. 



S. Bll. 4 (1898) 327-. 



as particular case. Cay ley, A. Crelle J. 

 65 (1866) 285-; 87 (1879) 161-. 



Theta functions with 2 variables. Cayley, A. 



Crelle J. Mth. 83 (1877) 210-, 220-. 



. Weber, H. Crelle J. Mth. 84 



(1878) 332-. 

 . Darboux, G. C. E. 92 (1881) 



685-, 1493-. 



, Gopel's biquadratic relation 



between 4, representation of surface by. 



BorcMrdt, C. W. Crelle J. Mth. 83 (1877) 



234-. 



Locus of centres of quadrics through 7 points 



of surface of 4th degree. Taylor, H. M. 



Mess. Mth. 13 (1884) 145-. 



(Taylor). 



Frost, P. Mess. Mth. 14 (1885) 97-. 

 point, product of whose distances from 3 



coplanar lines is constant. Czuber, E. Mh. 



Mth. Ps. 3 (1892) 217-. 

 Nodal points, biplanar and uniplanar, theory. 



Rohn, K. Mth. A. 22 (1883) 124-. 

 Normal developable of quadric cone. Jaroli- 



mek, C. Casopis 8 (*1879) 247-; Fschr. 



Mth. (*1879) 574-. 



surfaces, certain. Sucharda, A. Prag Sb. 

 (1889) 2 (Mth.-Nt.) 385-. 



One-sided surface ("marrowbone"). Schoute, 

 P. H. Edinb. E. S. P. 19 (1893) 208-. 



surfaces, class. Feldblmn, M. Wiad. 

 Mt. 1 (1897) 101- ; Fschr. Mth. (1897) 

 579. 



Parallel projection, and surfaces. Matzka, W. 

 [1874] Prag Ab. 7 (1875) (Mth.) 70 pp. 



surface of ellipsoid. Cayley, A. Tortolini 

 A. 3 (1860) 345-. 



. Fiedler, W. Grunert Arch. 39 



(1862) 19-. 

 . Craig, T. Crelle J. Mth. 93 



(1882) 251-. 



surfaces. Hoppe, R. Arch. Mth. Ps. 1 

 (1884) 280-. 



of conicoids and conies. Roberts, S. 

 [1872] L. Mth. S. P. 4 (1871-73) 57-. 



Special Algebraic Surfaces 



7650 



Parallel surfaces, cylindrical. Dienger, J. 

 Grunert Arch. 10 (1847) 54-. 



, and lines on surface. Bordoni, A. Mil. 



G. I. Lomb. 5 (1853) 70-. 



Polar surfaces of certain ring-surfaces. Su- 

 charda, A. Casopis 13 (1884) 1-, 161- ; 

 Fschr. Mth. (1884) 708-. 



Quadricuspidal surfaces. La Gournerie, J. de. 

 Liouv. J. Mth. 15 (1870) 264-. 



Rational surfaces, case. Brambilla, A. Pa- 

 lermo Cir. Mt. Ed. 2 (1888) 176-. 



connected with theory of complex vari- 

 able. Pincherle, S. Mil. I. Lomb. Ed. 24 



(1891) 354-. 



, ruled, 4th degree, general properties. 



Ameseder, A. [1879] Arch. Mth. Ps. 65 



(1880) 239-. 

 , skew. Genty, . Par. S. Mth. Bll. 



19 (1891) 70-. 

 , 4th degree. Noether, M. Mth. A. 33 



(1889) 546-. 

 , 9th degree, double curve of special case. 



Brambilla, A. G. Mt. 32 (1894) 133-. 

 Eeciprocal to surface of centres of central 



quadric. Roberts, S. QJ. Mth. 13 (1875) 



188-. 



surfaces of same degree as their polars, and 

 with same singularities. Rummer, E, E. 



Berl. Ak. Mb. (1878) 25-. 

 Eeciprocity in central surfaces of 4th degree, 

 case. Sucharda, A. Wien Ak. Sb. 101 



(1892) (Ab. 2a) 585-. 



Eotation surface with algebraic geodesies. 

 Tannery, J. Par. S. Phlm. Bll. 4 (1892) 

 85-. ' 



serving as type of pseudo-spherical sur- 

 faces. Beltrami, E. G. Mt. 10 (1872) 

 147-. 



surfaces. Mann, F. Grunert Arch. 29 

 (1857) 446-. 



generated by conies. La Gournerie, J. de. 



Par. EC. Pol. J. 40 e cah. (1863) 1- ; Liouv. 



J. Mth. 8 (1863) 52-. 

 , plane sections. Benedict, . 



Silliman J. 31 (1837) 258-. 

 with generator known graphically, ele- 

 ments. Andre, L. Ev. Artl. 5 (1875) 



546-. 

 lemniscate for meridian. Levi, D. 



G. Mt. 21 (1883) 379-. 

 Ruled surfaces, general theorem. Darboux, G. 



Bll. Sc. Mth. As. 2 (1871) 301- . 

 generated by straight line resting on 3 



directrix curves. Salmon, G. Camb. and 



Dubl. Mth. J. 8 (1853) 45-. 

 , genus p = 0. Clebsch, R. F. A. [1871] 



Mth. A. 5 (1872) 1-. 

 , new (La Gournerie). Chasles, M. C. R. 



63 (1866) 254-. 

 , 3rd degree. Bioche, C. Par. S. Phlm. 



Bll. 6 (1894) (C. R., No. 13) 1-. 

 , , case. Moshammer, K. WienAk. 



Sb. 73 (1876) (Ab. 2) 143-. 

 , , model. La Gournerie, J. de. 



Par. A. Cons. 6 (1866) 205-. 

 , and 4th degrees, obtained from circle. 



Godefroy, A. N. N. Arch. Wisk. 20 (1893) 



108-. 



543 



