492 APPENDIX. 



of Horsfield, illustrating his remarks by specimens and figures. 

 — Dr Deuchar gave an account of some new tests for easily 

 distinguishing carbonates from bi-carbonates, and exhibited the 

 mode of making the experiments. — Sir Patrick Walker then 

 read notices regarding the occurrence, near Edinburgh, of se- 

 veral native birds, generally regarded as extremely rare, parti- 

 cularly the Motacilla neglecta, first remarked by him on the 

 banks of the Water of Leith in 1804 (but referred by him to the 

 Motacilla flava, until he became acquainted with Gould's obser- 

 vations), and often observed since that time ; likewise the Red- 

 start (Sylvia Phoenicurus) in various places around the city ; the 

 Duskj' Grebe, shot at Lochend ; and the Ardea minuta, killed at 

 the mouth of the Tyne in East Lothian. — Mr K. T. Kemp exhi- 

 bited the experiment of the solidification of sulphurous acid. 



Bindon Blood, Esq., Vice-President, in the chair — A paper 

 was read, entitled, " Remarks on the circumstances to be chiefly 

 attended to in the execution of a Geological Survey of Scot- 

 land." — Mr Kemp shewed a method of liquefying chlorine at a 

 cold of — 26° Fahr., and of keeping it in a liquid state at the 

 temperature of the atmosphere, by a pressure equal to five at- 

 mospheres and a half. 



Robert Stevenson, Esq., Vice-President, in the chair. — Mr 

 Kemp described and exhibited experiments, proving that chlo- 

 rine, iodine, bromine, &c., bleach without the decomposition of 

 water or the presence of oxygen gas. He likewise shewed a 

 modification of the'difFerential thermometer — Suggestions were 

 communicated, by the Rev. Mr Robertson of Inverkeithing, 

 of easy methods of analysis, for practical purposes, of the mi- 

 neral waters usually met with — Dr Martin Barry laid upon 

 the table specimens of red sandstone, from the county of Ty- 

 rone, abounding in fossil fishes belonging to the [species Pa- 

 laeoniscus catopterus, Agass. — Dr Traill exhibited specimens of 



