590 INDEX. 
Page 
Frog, Mr Burd's notice respecting an instance of mis- 
directed instinct in it, _ - - 567 
Fruit-trees, Mr Stevenson on the prejudicial effects of a 
layer of bog iron-ore upon, - - - 571 
G 
Gawilghur Range of Hills, Mr Vaysey's account of some 
fossil shells found in it, 289 — Geographical account of 
these hills, 289 — Of the newest Floetz Trap Forma- 
tion, 290 — Results of their investigation, 290-— The 
principal part compact basalt, 29O — Wacke, 29I — No- 
dular wacke or basalt, 29I — Columnar basalt, 291 — 
Simple minerals contained in the wacke, 293 — The 
shells belong either to the genus Conus or Voluta, and ' 
are flattened, 295 — The rocks containing them inferred 
to be of igneous origin, - _ - 2^6 
Geology and Geognosy, Dr Grierson's general observa- 
tions on their nature, 401 — Account of the principal 
theories of geologists, 403 — Huttonian theory, 405 — 
Wernerian theory, 407 — Legitimate objects of Mine- 
ralogy and Geology, 498 — The term Geognosy intro- 
duced by Werner, to distinguish the truly useful from 
the merely speculative part of mineralogy, - 409 
Gnaphalium and Xeranthemum of Linnaeus, Mr Don's 
memoir on the classification and division of, 533 — Re- 
marks illustrative of the family of Compositse, 534 — 
Characters of the genus Xeranthemum, 538 — Chardi- 
nia, 539 — Leucostemma, 540 — Astelma, 542 — Aphe- 
lexis, 546 — Euchloris, 548 — Helichrysum, 549 — Pen- 
tataxis, 550 — Spiralepsis, 551 — Petalacte, 552 — Phse- 
nocoma, 554 — Carpholoma, 555 — Metalasia, 556 — An- 
tennaria, 560 — Leontopodon, 56l — Gnaphalium, 563 
— Characters of the genus, - 563 
Greville, Robert Kaye, Esq. his new Arrangement of the 
Genera of Mosses, 42 — continued, 442. — Descriptions 
of two new species of Mosses from America, 481 — Ad- 
dendum, - - - - - 564 
