HISTORY OF THE SOCIETY. 
571 
Forth, and at several hundred yards distance from the pre- 
sent bed of the river; communicated by Mr Alexander 
Blackadder, Allan- Park. A stuiFed specimen of the Dog 
of New South Wales, presented to the Museum by Gover- 
nor Brisbane, was then exhibited, and described by Pro- 
fessor Jameson. 
Professor Jameson communicated Mr A. Blackadder''s 1824. 
Observations on the Alluvial Strata of the Forth District, 
illustrated by a Geognostical Map. Mr Witham of Lar- 
tington read a Memoir on some peculiarities existing in the 
Trap Rocks in the west and north-west of the counties of 
York, Durham, Westmoreland, and Northumberland. The 
Secretary read a Notice regarding the Pernicious Effects on 
Fruit-trees, of the layer of bog-iron-ore immediately under 
the surface-soil in Aberdeenshire, provincially termed ^an,* 
communicated by Mr Stevenson, Civil-Engineer. Mr F. A. 
Parry exhibited a remarkable stalagmite or deposition 
formed at the bottom of one of the tanks of lime-water at 
Canongate of Edinburgh, through which the coal-gas is 
passed with a view to its purification. Mr Deuchar then 
communicated his view of the comparative merits of the 
different Theories of Galvanic Action. 
The Secretary read, 1st, A Notice of the incarceration Nov. 13, 
of a live Toad {Rana verrucosa) in the wall of Fort- Wil- 
liam Barracks, Calcutta, for the period of fifty-four years ; 
communicated by Major-General Hardwick ; 2J, Account 
of the Monocotyledonous and Acotyledonous Plants found 
between the 4th and 11th degrees of north latitude, on the 
western coast of Africa ; by Mr George Don ; Sd, Notice 
of a viviparous variety of Juncus lampocarpus ; communi- 
cated by Mr Parry, 
