407 
CLASSIFICATION 
408 
422 
430 
432 
437 
441 
446 
455 
463 
Geometry : 
Geometrical constructions: (i) in optics, 639. 
(ii) for solar eclipses, 688. 
Quartic curves, 643, 667. 
Construction of Cartesians, 674. 
Correspondence, 673, 683, 689, 694. 
Quadric surfaces, 678. 
Quartic surfaces, 647, 650, 662, 664, 680, 700. 
Sextic and other torses, 652, 653. 
Octic surfaces, 654, 671. 
Line-geometry, 682. 
Fleflecnodal planes, 675. 
Flexure of surfaces, 641, 691. 
Minimal surface, 651. 
Regular solids, 679. 
Analysis : 
Trigonometry, 630, 634. 
Theory of equations, 631, 694. 
Groups, 659, 660, 690, 694. 
Combinatory analysis, 634, 644, 668, 669, 670, 672. 
Invariants and covariants, 681, 696, 698. 
566