Geometry. 



173 



7630 



SitzBer. Ak. Wis.s., 115, 190G, Abt. Ila, 

 (!K)5-'J22). 



Torka, Joh. Die Flachcu II. Ord- 

 nung in den inatheinati.schen Getrie- 

 beii. Ein System der Raumgetricbc. 

 Berlin, Verb. Ver. Gcwerbfl., 84, 1905, 

 (183-217. 223-238). 



Weierstrass. Beweis eines Satzes 

 von Steiner : fj.Es sci gcgcbcn cine 

 Reilic von festen Piinkten p, p2 t'to. 

 niit ziigehorigen Zahlen (.Massen) ni, nij 

 etc. Bezeiohncn nun p, p2 . . . die 

 Abstande dicser Punkte von ciner 

 veriinderlichen Ebene (E.), und .setzt 

 man ^ mp- = K, wo K eine Kon- 



stante bedeutet, so beriibit E cine 

 bestimmte Flacbc zweiten Grades".] 

 [Ill: Miiller, Felix, Karl Schellbach.] 

 Abh. Gesch. math. Wiss., Leijizig, 

 H. 20, 1905, (79-80). 



7260 SYSTEMS OF QUADRIC 

 SURFACES. 



Bianchi, L. Sur la deformation des 

 quadriques. Paris, C.-R. Acad, sci., 

 142, 1906, (562-564). 



Carver, Walter B. A method of 

 constructing a quadric polarity in 

 space. Baltimore, Md.. Johns Hopkins 

 Univ. Cir., (N. Ser.), No. 2, 1904, (53- 

 59, with text fig.). 



Schoute, P[ieter] H[endrik]. [How 

 four progressively related pencils of 

 rays may be chosen in such a way 

 that each quadruplet of corresponding 

 rays lies hyperboloidically. Discussion 

 of] a particular series of quadratic 

 surfaces [each containing the trans- 

 versals of one of such quadruplets] 

 with eight common points and eight 

 common tangential planes. Charac- 



teristic numbers. Amsterdam, Proc. 

 Sci. K. Akad. Wet., 8, 1906, (754- 

 767) (English); Amsterdam, Versl. 

 Wis. Nat. Afd. K. Akad. Wet., 14, 

 1906, (737-751) (Dutch). 



Algebraic Curves and Surfaces of 

 degree higher than the second. 



7600 GENERAL. 



Beidon, Louis. Theorie des divisions 

 heterographiques. Theorie des courbes 

 algebriques. Paris. Bui. soc. philom., 

 (ser. 9), 5-6, 1902-1904, (68-116). 



7610 METRICAL PROPERTIES 

 OF Ai.(;EBJiAlC PLANE 

 CUilX'ES OF DEGREE HIGHER 

 THAN THE SECOND. 



Basset, Alfred Barnard. Compound 

 singularities of curves. Q. J. Math., 

 London, 37, 1906, (31.3-328). 



Brooks, Charles Edward. A note 

 on the orthic cubic curve. Baltimore, 

 Md., .John Hopkins Univ. Cir., (N. 

 Ser.), No. 2, 1904, (47-52). 



Gomes Teixeira, F. Sur quebpies 

 proprictes des cubiques. [Series de 

 coniques bitangcntes passant par deux 

 jioints fixes de la cubicjue. La cubique 

 coiuine lieu de contact des tangentes 

 menees d'un (pielconque de ses jraints 

 aux coniques passant par les points ou 

 elle est coupee par la polaire du point 

 considere.] Amsterdam, Nieuw Arch. 

 Wisk., (Ser. 2), 7, [1906], (247-249). 



Lo TVIonaco-Aprile, L. Sulla super- 

 ficie luogo dei contatti di 1° ordine 

 delle superficie di un fascio con quelle 

 di una rete, generali, e sue applica- 

 zioni. Palermo, Rend. Circ. mat., 18, 

 1905, (1-10). 



Morley, Frank. On two cubic curves 

 in triangular relation. London, Proc. 

 Math. Soc, (Ser. 2), 4, 1906, (384-392, 

 with 1 pi.). 



Schuh, F[rederick]. On the locus of 

 the pairs of common points and the 

 envelope of the common chords of the 

 curves of three pencils. 1st part. 

 [Order of the locus. Multiple points. 

 Class of the envelope.] Amsterdam. 

 Proc. Sci. K. Akad. Wet., 9, [1906], 

 (424-434) (English) ; Amsterdam, 

 Versl. Wis. Nat. Afd. K. Akad. Wet., 

 15, [1906], (412-422) (Dutch). 



Stephens, R[oswell] P[owell]. A 

 curve of the fifth class. Baltimore, 

 Md., .Johns Hopkins Univ. Cir., (N. 

 Ser.), No. 1, 1905, (23-26). 



Stuyvaert. Quadrilatcres de Steiner 

 dans certaines courbes et surfaces 

 algebriques. Nouv. arm. math., Paris, 

 (ser. 4), 5, 1905, (455-470). 



7630 SPECIAL PLANE ALGE- 

 BRAIC CURVES. 



Berzolari, L. Sulla lemniscata pro- 

 jettiva. Milano, Rend. 1st. Lomb., 

 (Ser. 2), 37, 1904, (277-288, 304-313), 



