CONTENTS 

 OF THE SIXTY-FIRST VOLUME. 



QN Animals receiving their Nutriment from Mineral Sub- 

 stances. Bt/ the Rev.W.KiRBY, M.A.F.R.S.F.L.S. 3 



Thermomctrical Experiments in ascertaining the Strength of 

 the Sun's Rays in a keen frosty Day^ 8(c. 8fc. By Dr. 



W. BURNEY .... - 4 



On Aerial Navigation • 6 



On the Ornithorhynchus paradoxus, or MuUingong, its veno- 

 mous Spur, and general Structure. By Mr. Patrick 



Hill, Surgeon in the Royal Navy 8 



Observations on the Flexure of Astronomical Instruments. 



By Mr. Thomas Trehgold, Civil Engineer . . 10 



On certain Species o/'Carduus and Cnicus which appear to be 



dioecious. By Thomas Smith, Esq. F.R.S.Sf L.S. 14 



On the Crystallization of Cast Iron. By Mr. David Mushet 



22, 83 



On the Declination of the fixed Stars. By Professor Bessel. 



Sent from Konigsberg 19th August \%11 ... 25 



A comparative Statement of some of the different Features in 



Pillar Work and Way-going Work, in Coal-Mines ; and 



on the Ventilation ofCoal-Mines 30-32 



Observations on the Vinous Fermentation; with a Description 



of an Apparatus for the Improvement of the Process ac- 



cordincr to the Method invented by Madame Gervais . 34 



A Defence of the New Theory of the Tides, in reply to 



Mr. H. Russell's Observations. By Capt. Forman . 42 



Method of determining the Proportion of Carbonic Acid in 



Mineral Waters . . ." 'n ' t ^^ 



On the Application of Potassium in Eudiometry. By Jona 

 MxjuRKY, F.L.SM.W.S.Sfc. . . . . . ,. . 53 



True apparent Right Ascension of Dr. Maskelyne s 36 Stars 



for every Day m the Year 1823, at the time of passing the 



Meridian of Greenwich. By the Rev. J. Grooby, 53, 



•^ 197,245, 364, 434 



On the combined Action of Heat and Pressure on Water, 



Sulphuric JEther, and rectified Oil of Petroleum. By the 



Baro?/ Cagniard DE LA Tour 58 



Vol. 61. No. 302. June 1823. a 



