690 
Scientific Proceedings, Royal Dublin Society. 
INDEX. 
Accretion, growth by, 565, 566. 
Anomalies, optical, in crystals, 629 e¢ seq. 
Appendix, 686. 
Bent crystals, 568. 
Benzene-nucleus, effect of presence of, 
592. 
Branched erystals, 573, 575. 
Chemical compounds, nature of liquid-, 
584, 673. 
Cleavage, 581. 
Closest-packing, law of, 688. [532. 
Closest-packing of units of a single kind, 
two kinds, 546. 
three or more kinds, 
560. 
Combination of assemblages, 589, 673. 
Concepts, 529, 686. 
Crystallizing out, 682. 
Crystalloids and colloids, 666, 682. 
Curved crystals, 568. 
®. 
Decomposition, chemical, 682, 683. 
Diffusion, 670, 679, 682. 
Dimorphism, 575, 623. 
Doppelte Systeme of Fedorow, 564. 
Double salts, 619, 678. 
Elastic balls, closest-packing of, 529, 546 
note 1. 
Enantiomorphous centres, 564. 
Enantiomorphous groupings, 593. 
Gases, diffusion of, 679. 
Globulites, 567. 
Groups of a single kind, 585. 
Growth by accretion, 565, 566. 
Iceland spar, artificial twinning of, 646. 
Isogonism, 648, 661. 
Tsomerism, 590, 598, 597, 605. 
Isomorphism, 647. 
Kelvin (Lord), on homogeneity, 527, 529,, 
533, 686. 
Linkage, 530, 563, 589, 591, 676. 
Liquid crystals, 565. 
Mixed crystals, 647, 656, 665. 
Partitioning into groups, 582, 585. 
Polar properties, pyro-electric, 
electric, &c., 582. 
Polymerisation, 678. 
Polymorphism, 575, 623. 
piezo- 
Racemation due to homogeneous mixture, 
596, 603. 
Repulsion, centres of, 529, 686, 687. 
Rotation of plane of polarization by 
liquids, 592. 
Saturation, chemical, connected with 
close-packing, 607, 680. 
Solutions, 670. 
Stability connected with close-packing, 
681. 
Substitution, chemical, geometrical possi- 
bilities in, 608. 
Symmetry, types of, 
cubic, holohedral, 533, 5438, 548, 549. 
dodecahedral-hemihedral, 536, 
562. 
gyrohedral, 538, 551. 
tetrahedral, 542, 550. 
tetartohedral, 560. 
hexagonal, holohedral, 534, 539, 540, 
553. 
pyramidal- hemihedral, 557, 561. 
» rhombohedral, 537, 544. 
hemimorphic, "555. 
tetartohedral, 556. 
tetragonal, pyramidal-hemihedral, 
562 
rhombic, 558. 
monoclinic, 559, 560. 
Ties, 530, 563, 589, 591, 676. 
Twinning, 620-647. 
Unhomogeneous assemblages, 543, 568, 
649, 663, 664, 672. 
Valency, 681. 
Vicinal faces, 638, 634, 636. 
Water of crystallization, 619, 678. 
Zeolites, 640. 
