vill CONTENTS. 
Mr. W. Huceon on the Alkaline Waters of Leeds ...ese.ssecescssssctecrssoeecceese 
Dr. H. Bencrt Jones, Some Account of Profersor Schonbein’s latest Experi- 
ments on the Allotropic Conditions of Oxygen .......scsecseceeenreecseeneeeneesees 
Dr. Epwin Lanxester on an Instrument for Measuring the Constant Intensity 
OP OZORE ves ese see ce neces Mencle Haldeiniea setnneied slay a tiereciratte lectaatengreis ss..00. 0a se amelie 
Mr. J. B. Lawes and Dr. J. H. Givaert on the Annual Yield of Nitrogen per 
Acre in different Crops......+.. Sannin dp): spies stale vcaniiestewsiens askinae Pence asadeens 
Dr. W. Lauper Linpsay on the Action of Hard Waters upon Lead.........4.. 
On an improved Electric Lamp invented and manufactured by Mr. W1LL1AmM 
Harr. (Communicated by Dr. STEVENSON MACADAM.) ...csscsseseeeeeeee ies 
Dr. Stevenson Macapam on M. de Luca’s Claim to be the Discoverer of the 
Non- Presence of Iodine in the Atmospheric Air, Rain- Water, and Snow..... 
os ’s Note on the Production of a Frosted Surface on 
Articles made of Aluminium ........sssseeeseeeees wash nesioe ceed gush os sean seat t een 
Dr. J. A. Marruressen on the Combustibility and other Properties of the 
Rarer Metals ...ecccssseseoscessseseceeens cudeadcenresesens webestensdneens ten dasdas viene whe 
Mr. Joun Mercer on Chromatic Photographs.......... iecedeawiede eoeacedst aeeapee 
——___————— on the Relation of the Atomic Weights of the Families of 
GHC AML MICLES peu nn waveveiensspevencavic-osep ves vewsasucesssencarenssenn seston enesttanetanes 
Dr. W. Opurne on the Atom of Tin.......... Se cwavaciettialaee Ge actenMeeegeae tux oaeekee 
Mr. W. H. Perxin on the Purple Dye obtained from Coal-Tar .......cssss00e eee 
Mr. Joun Mercer an the Atomic Weights of the Elements of Six Chemical 
Families ......... Baectuisavisaniione Peet inssnstetectel matt alee Redieahie ahs ssavauu de ecch dewey sunaeee : 
Dr. Puex on a new Method for the Quantitative Estimation of Nitric Acid.... 
Rev. J. B. Reape on Animal Ammonia, its Formation, Evolution, and Office.. 
Mr. R. Reynotps on the Practical Application of Aluminium............. sounten 
Mr. W. L. Surru on the Choice of Subject in Photography, and the Adapta- 
tion of different Processes ......seesseeeeeeeeene auvevasenbtcvsccsvedersesbeetals eaveceeee 
Dr. E. Smirx on a new Method of Determining the Quantity of Carbonic Aci 
CONLAMMCH INVENT WAIT aeerersteccsecessrcndemersNistwan eoxcivcavhesccerstoeresee vouswasetie 
Mr. W. K. SuLiivan on some Double Salts formed with Bichromate of Potash 
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Professor VOELCKER on the Constitution of the Mineral Portion of Bones, and . 
the Analysis of Common Bone-ash, Animal Charcoal, &C. ......ssseesscseeseeees 
Dr. W. Wattace on the Carbonates of Alumina, Chromic Oxide, and Ferric 
Oxide ....... Guevdcbwagepacsae sith Souece teavarthaeccastecitevtowaresesehe cance nt eEeee a 
on Chloro-Arsenious Acid, and some of its Compounds...... 
Mr. W. S. Warp’s Observations on Dry Collodion Processes ........sssesseeerees 
Mr. R. Warinerton on the Source of Ammonia in Volcanic Emanation......... 
Mr. Jonn WaTeEruouseE on an Instrument for maintaining a Water-Bath at 
constant Temperatures crrececcescsscceesveres nsvieGsetvedastodeed etecs usec vena ms as 
GEOLOGY. 
Address by Mr. Witt1am Hopkins, President of the Section ......... ry ts 
Rev. Dr. ANDERSON on the Fossil Fishes and Yellow Sandstone.....sceccoceceece 
Mr. T. W. Arxrnson on the Volcanoes of Central Asia, commencing with the 
Baikal, in Oriental Siberia, and extending into Mongolia and Chinese Tartary, 
illustrated by a beautiful series of drawings of the principal volcanic scenes 
BMTPOCA ess cate scaccpcoreresavedievveveesvadccecscevs sadvessestebegce te a 
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