588 INDEX. 
Page 
isosceles four-sided pyramid, 491 — The pyramid (P)3 
of pyramidal zircon, 492 — Scalene four-sided pyramid, 
4,94 — Right rhombic prism, 494 — Regular six-sided 
prism, 495- — Regular six-sided prism, whose lateral 
planes are squares, 495— Regular six-sided prism, whose 
sides are squares, 496 — Rhombohedron, 499 — Scalene 
six-sided pyramid, 500 Projections of compound 
forms, 501 — Combination of the hexahedron and octa- 
hedron, 501 — Rhombohedral combination R. (P)^^. 
R-f-2, of the species of rhombohedral lime-haloide, 
503— The pyramidal combination P. (P)^. ™ P + 3. 
P-f- 00 , of the species of pyramidal zircon, - - 505 
D 
Dempster, William, Dr Barnes's account of his swallowing 
a table-knife, - - - - - 570 
Dicranum bryoides, flexuosum, and cirrhatum, described, 201 
Diphyscium, generic characters of, - - - 73 
Dissodon, generic characters of, - - - 46I 
Diver, red-throated, its bones of a dark colour, - 570 
Don, Mr David, his classification of the genera Gnapha- 
lium and Xeranthemum of Linnaeus, 533 — Monograph 
of the genus Pyrola, - « _ 220 
Drawing crystals in true perspective, Mr Haidinger's ac- 
count of the method of, - - - 485 
Drummond, Henry Home, Esq. his notice regarding bones 
of a whale discovered in the district of Monteith, - 440 
E 
Edmondston, Laurence, Esq* his observations on the 
Lesser Guillemot and Black-billed Auk, proving them 
to be identical with the Foolish Guillemot and Com- 
mon Auk, - - - - 8 
Explosion of Stobbs Gunpowder Mills, Dr Grierson's ac- 
count of the, 576— Additional notice regarding it, - 576 
