ROB] 



759 



[ROB 



Roberts, Samuel. 18. Ou the centres of mean 

 distances of certain points of intersection of 

 curves and surfaces. Quart. Journ. Math. IX., 

 1868, pp. 63-71. 



19. On the order of the conditions that 



four curves may have two points in common. 

 Quart, Jouru. Math. IX., 1868, pp. 176-179. 

 20. Note ou the figure formed by sixteen 



cotaugeutial chords of a curve of the third degree. 

 Quart, Journ. Math. IX., 1868, pp. 232-234. 



21. On the order of certain systems of 



algebraical equations. [1867.] London, Math. 

 Soc. Proc. II., 1869, pp. 8-20. 



22. On the mechanical description of some 



species of circular curves of the third and fourth 

 degrees. London, Math. Soc. Proc. II., 1869, 

 pp. 125-136. 



23. On the order of the discriminant of a 



ternary form. [1869.] London, Math. Soc. 

 Proc. III., 1869-71, pp. 14-18. 



24. On the pedals of conic sections. 



[1870.] London, Math. Soc. Proc. III., 1869- 

 71, pp. 88-99. 



25. On the ovals of DESCARTES. [1870.] 



London, Math. Soc. Proc. III., 1869-71, pp. 

 106-126. 



26. On the order and singularities of the 



parallel of an algebraical curve. [1871.] Lon- 

 don, Math. Soc. Proc. III., 1869-71, pp. 209- 

 220. 



27. On the motion of a plane under certain 

 conditions. [1871.] London, Math. Soc. Proc. 

 III., 1869-71, pp. 286-318. 



28. On the degree of the discriminant with 



respect to a parameter in certain cases. [1869.] 

 Quart. Jouru. Math. X., 1870, pp. 204-210. 



29. Note sur les podaires ceutrales des 



couiques. Nouv. Ann. Math. X., 1871, pp. 

 208-211. 



30. Note on a binary evectaut form. 



Quart. Jouru. Math., XL, 1871, pp. 42-47. 



31. On the parallel surfaces of conicoids 



and conies. [1872.] London, Math. Soc. Proc. 

 IV., 1871-73, pp. 57-91. 



32. On Professor CREMONA'S Transforma- 

 tion between two planes, and tables relating 

 thereto. [1872.] London, Math. Soc. Proc. 

 IV., 1871-73, pp. 121-139. 



33. On parallel surfaces. [1873.] Lon- 

 don, Math. Soc. Proc. IV., 1871-73, pp. 218- 

 235. 



34. Notes on normals and the surface of 



centres of an algebraical surface. [1873.] 

 London, Math. Soc. Proc. IV., 1871-73, pp. 

 302307. 



35. Note on the Pliickerian characteristics 



of epi- and hypo-trochoids and allied curves. 

 [1873.] London, Math. Soc. Proc. IV., 1871- 

 73, pp. 353-356. 



Roberts, Samuel. 36. Note on the parallel 



curves of conies. Quarterly Journ. Math. XII., 



1873, pp. 58-65. 

 37. On the order of the condition that two 



surfaces may touch. Quarterly Journ. Math. 



XII., 1873, pp. 229-231. 



38. On the Pliickerian characteristics of a 



curve whose equation is a resultant or a discri- 

 minant in some general cases. Quarterly Jouru. 

 Math. XII., 1873, pp. 281-304. 



Roberts, Thomas. On the teeth of wheels : an 

 improved method of approximating to the true 

 epicycloidal forms by circular arcs. North 

 Engl. Inst. Min. Engiu. Trans. XXL, 1872, pp. 

 271-284. 



Roberts, William. 45. *Sur un systeme de 

 courbes et surfaces derivees, et en particulier sur 

 quelques surfaces analogues aux ellipses de 

 CASSINI. Annali di Matemat. IV., 1861, pp. 

 133-150. 



46. *Cubature de la surface des ondes. 



Annali di Matemat. IV., 1861, pp. 345-347. 



47. *Constructiou geometrique des trans- 

 formations de JACOBI des fouctions elliptiques 

 F, pour le cas ou le uouibre p a 3 pour valeur. 

 Aunali di Matemat. V., 1863, pp. 225-226. 



48. Sur les trajectoires sous un angle 



quelconque donue, d'un systeme de coniques, 

 planes et spheriques, homofocales. Annali di 

 Matemat. VI., 1864, pp. 28-32. 



49. Note sur la theorie des courbes podaires 



successives. Nouv. Ann. Math. III., 1864, pp. 

 80-81. 



50. Sur quelques systemes triples orthogo- 



naux de surfaces algebriques. Paris, Acad. Sci. 

 Compt. Eend. LVI1L, 1864, pp. 291-292. 



51. Application d'un theoreme d'ABEL sur 



les transformations modulaires des fonctious 

 elliptiques a la solution d'un problems de geome- 

 tric. Paris, Acad. Sci. Compt. Rend. LVIIL, 



1864, pp. 709-710. 



52. Sur uue integrate double definie. An- 

 nali di Matemat. in., 1869-70, pp. 327-330. 



53. Sur les courbes oquidistautes spheri- 

 ques. [1869.] Annali di Matemat. IV., 1870- 

 71, pp. 207-211. 



Roberts, William. On a specimen of obsidian 

 from Java. Brit. Assoc. Eep. XXXIX., 1869 

 (Sect.\ p. 74. 



Roberts, (Dr.) William. 8. On the solvent 

 treatment of urinary calculi : an experimental 

 and clinical inquiry. Med. Chir. Trans. XL VIII., 



1865, pp. 89-134. 



9. [Experiments on the question of bio- 

 genesis.] Manchester, Lit. Phil. Soc. Proc. 

 XII., 1873, pp. 52-55 ; Monthly Microsc. Journ. 

 IX., 1873, pp. 228-230. 



