570 
APPENDIX, 
Sertulariadse found in Hudson's Straits. Mr Arnott then 
read a communication from Prideaux John Selby, Esq. of 
Twizel House, containing some curious particulars in the 
Natural History of the Golden Regulus. 
1824. Mr Parry read a continuation of Notices regarding the 
^i^"^ ^* Management of Young Plantations. Dr Knox then com- 
municated some Remarks on the supposed Discoveries of 
Professor Tiedemann, and Dr Fohmann, relative to the 
non-existence, in the Phoca vitulina, of the vasa effereii- 
tia. 
April 17. Dr Knox read a short Paper on the Colymbus septen- 
trionalis, or Red- throated Diver, shewing that the bones 
are black or dark-coloured, and that this coloration depends 
on the periosteum. Mr Deuchar communicated some Re- 
marks on Meteoric Stones, and proposed a theory to ac- 
count for their formation. At the same meeting, there was 
laid before the Society the first part of a Memoir on the 
Sandfield in the vicinity of Edinburgh, by Mr Alexander 
Blackadder. 
May 1. The Secretary read a communication sent to the Society, 
entitled. Observations and Experiments on the Formation 
of Pearls. Also, Notice of a Substitute for Cork, in Tro- 
pical Climates, being the central part of the scape of Agave 
vivipara; by the Reverend Lansdown Guilding of St Vin- 
cent ; with Specimens of the Prepared Agave-Cork. And 
likewise an Account of William Dempster, who accidental- 
ly swallowed a large Table-knife, at Carlisle in November 
last, by Dr Barnes of Carlisle. Professor J ameson read a 
Notice of the Discovery of some Fossil Remains of a Whale 
found near the seat of Lord Dunmore^ on the banks of the 
