CONTENTS. XI 



Page 

 11. On some curious Concretion Balls derived from a Colliery Mineral Water. 

 By Thomas Andrews, F.O.S 312 



TUESDAY, AUGUST 26, 1879. 



1. On some points in connection with Agricultural Chemistry. By Dr. J. 



H. Gilbert, F.R.S 315 



2. The Rare Metals of the Yttrium Group. By T. S. Humpldge, Ph.D., ■ 

 B.Sc. (Lond.) 316 



3. On the Synthesis of Hydrocyauic Acid. By Professor Dewar, F.R.S. ... 317 



4. On the amount of Nitrous Acid produced in Electric Illumination. By 

 Professor Dewar, F.R.S 317 



5. On the Kinoline Bases. By Professor Dewar, F.R.S 317 



6. An account of some recent Experiments on Supersaturated Solutions. By 



John M. Thomson 317 



7. Notes on recent Spectral Observations. By J. Norman Lockyer, F.R.S. 317 



8. Notes on Petroleum Spirit or 'Benzoline.' By Alfred H. Allen 318 



9. On the Illuminative Value of a Mixture of Hydrogen with some Hydro- 

 carbons. By A. Vernon Harcotjrt, M.A., F.R.S., Lee's Reader in 

 Chemistry at Christ Church, Oxford 319 



10. The New Condenser. By George S. Hazlehtjrst 320 



WEBNESDA Y, A UG UST 27, 1 879. 



1. Notes on a Sample of Fuller's Earth, found in a Fullonica recently exca- 

 vated at Pompeii. By William Thomson, F.R.S.E 321 



2. On the Detection of Milk Adulteration. By William H. Watson, F.C.S. 322 



3. Chemical Researches on Palmella Omenta. By Dr. T. L. Phipson, 

 F.C.S. London, formerly of the University of Brussels, Cor. Memb. of the 

 Chemical Society of Paris, and of the Royal Society of Med. and Nat. 

 Sciences of Brussels 322 



4. Description of a Glass Burette for Collecting, Measuring, and Discharging 



Gas over Mercury. By Philip Braham, F.C.S 325 



Section C— GEOLOGY. 



THURSDAY, AUGUST 21, 1879. 



» 



Address by Professor P. Martin Duncan, F.R.S., Vice-President of the 



Geological Society 326 



1. Seventh Report of the Committee appointed for the purpose of recording 

 the position, height above the sea, lithological characters, size, and origin 

 of the Erratic Blocks of England, Wales, and Ireland, reporting other 

 matters of interest connected with the same, and taking measures for their 

 preservation 332 



2. Notice of the occurrence of a Fish allied to the Coccosteus in a bed of 



Devonian Limestone near Chudleigh. By John Edward Lee, F.G.S., 

 F.S.A 7 : 332 



