386 Proceedings of Philosophical Societies. [May, 



the height thus found was 1643 feet. The barometers were made 

 under the inspection of Mr. Daniell, with iron cisterns, as de- 

 scribed by Mr. Newman the maker, in a recent number of 

 the Quarterly Journal of the Royal Institution :* the one con- 

 veyed to the top of the hill was stationary there several days, and 

 repeated observations were made on each ; the mean height de- 

 duced from them was 1640 feet and a fraction, being less than 

 three feet in defect, when compared with the geometrical mea- 

 surement. The height is deduced from the barometrical obser- 

 vations by the method given by Mr. Daniell, in the Quarterly 

 Journal. 



The near accordance of these results will, Capt. S. hopes, be sa- 

 tisfactory to those who are practically acquainted with the very 

 ready means which the barometer affords of measuring heights ; 

 the doubt which had been thrown on its equal applicability in the 

 northern regions, as in the temperate and tropical climates, by 

 the great differences which appeared in a similar comparison 

 made by Capt. Phipps and Dr. Irving, in the year 1773, and 

 which are now shown to have originated in error of some kind, 

 being wholly removed. 



The Society, on account of the approaching festival, then 

 adjourned over two Thursdays, to meet again on the 29th of 

 April. 



LINNEAN SOCIETY. 



Dec. 16, 1823. — The reading of Mr. Murray's paper on the 

 Lampyris noctiluca was resumed and concluded ; and the fol- 

 lowing communications were read. 



" Observations on some of the terrestrial Mollusca of the 

 West Indies; By the Rev. Lansdown Guilding, BA. FLS." 

 Among the species described in this paper were Helicina occi- 

 dentalis, corpore livido, dorso tentaculisque atris, oculis pro- 

 minulis. — In montibus sylvosis Sancti Vincentii ; Bulimus Ike- 

 mostomus, corpore olivaceo-nigro, corrugato : pede subtus pal- 

 lido : capite bifariam crenato. — In dumetis Antillarum ; Buli- 

 mulus stramineus ; and Pupa undulala. 



" An account of some rare West Indian Crabs ; " by the same. 

 The Society then adjourned to January 21, 1824. 



Jan. 21. — Among the presents received at this meeting was a 

 specimen of a new species of Cyprinus vivlparus, from Don 

 Vincente de Cervantes, Professor of Botany in the University 

 of Mexico. 



A paper was read, " On a new species of the genus Gadus : 

 by Mr. Jonathan Couch of Polperro, in Cornwall." This dimi- 

 nutive species, called by fishermen the Mackarel Midge, is 

 only an inch and a quarter in length : its proportions are 

 nearly those of the Whiting. 



The reading was commenced of a paper " On the Natural 



* Mr. Newman's account of these instruments will be found in the last number of the 

 Annals. 



