418 Proceedings of the Wemcr'ian Society. 



tremely rare ; particularly the Motacilla neglecta, first remarked by 

 him on the banks of the Water of Leitli in 1804 (but referred 

 by him to the Motacilla flava^ until he became acquainted with 

 Gould's observations), and often observed since that time ; likewise 

 the Redstart, Sylvia Phcenicurus, in various places around the city ; 

 the Dusky Grebe, shot at Lochend ; and the Ardea minufa, killed 

 at the mouth of the Tyne in East Lothian. 



The members then removed to the portico, to witness an experi- 

 ment, performed in the open air, by Mr K. T. Kemp, shewing the 

 solidification of sulphurous acid. 



Jan. 23 — Bindon Blood, Esq. V.P. 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 then shewed a method of liquefying Chlorine at a cold 

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

 perature of the atmosphere, by a pressure equal to five atmospheres 

 and a half. 



1836, Feb, 6. — Robert Stevenson, Esq. V. P. in the Chair. Mr 

 Kemp described and exhibited experiments, proving that chlorine, 

 iodine, bromine, &c. bleach without the decomposition of water or 

 the presence of oxygen gas. He likewise shewed a new modifica- 

 tion of the diff^erential thermometer, capable, according to Mr Kemp, 

 of ascertaining whether the moon's rays, when concentrated, pos- 

 sesses heat equal to — 100° Fahr. 



Professor Jameson communicated Suggestions by the Reverend 

 Mr Robertson of Inverkeithing, of easy methods of analysis, for 

 practical purposes, of the mineral waters usually met with. 



Dr Martin Barry laid upon the table some specimens of Red 

 Sandstone, from the county of Tyrone, abounding in fossil fishes of 

 the palseoniscus tribe. Some discussion took place as to the age of 

 the sandstone. 



Dr Traill exhibited specimens of Sandstone-flag, containing large 

 scales of fishes, having a particularly marked surface, from Pomona, 

 Orkney. 



The Society, on the suggestion of the President and other mem- 

 bers of Council, recommend an application to the Light- House 

 Board for the cutting of marks on rocks at half tide-level, and the 

 2 



