iv CONTENTS= 
Page. 
XXII. — General Observations on Geology and Geo^ 
gnosy^ and the Nature of these respective Studies. 
By the Rev. Dr Grierson. _ - _ 401 
XXIII. — On the Mode of Growth^ Reproduction, and 
Structure of the Poiso7i-Fangs in Serpents. By 
Dr Knox. - - - - - 411 
XXIV. — On the Superficial Strata of the Forth Dis- 
trict. By A. Blackadder, Esq. - - 424 
XXV. — Notice regardi^ig Fossil Bones of a Whale 
discovered in the District of Monteith. By E. E. 
Drummond, Esq. . - . - 440 
XXVI. — Tentamen Metliodi Muscorum ; or, A New 
Arrangement of the Genera of Mosses, with Cha- 
racters, and Observations on their Distribution, 
History, and Structure. By Dr Greville, and 
G. A. V\r. Arnott, Esq. - - - 442 
XXVII. -— iVoiJicf? in regard to the Trap Rocks in the 
Mountain Districts of the West and North-zvest 
of the Counties of YorJi;, Durham, Westmoreland, 
Cumberland, and Northumberland. By Henry 
Witham, Esq. » - - ^ - 475 
XXVIII. — Descrip)tion of Tim Neio Species of 
Miisci, belonging to the Genera Neckera and Hyp- 
num. By Dr Greville. ... 481 
XXIX. — -Jccow7i^ of the Method of Drazving Crys- 
tals in True Perspective, followed in the Treatise 
on Mineralogy of Professor Mohs. By W. Hai- 
dinger, Esq. - - - - - 485 
XXX. — 'Account of some Fishes observed during 
Capt. Franldin and Dr Richardso)}^ s Journey to 
the Polar Sea. By Dr Richardson. = = 509 
