CONTENTS. Vii 
NUMBER LIV.—JUNE. 
Biographical Account of Collet-Descotils. By M. Gay-Lussac ........ 417 
On the Chemical Phenomena of Heat. By Mr. Emmett............. 421 
Researches respecting the Laws of the Dilatation of Liquids at all Tempe- 
ratures. By M. Biot, concluded . Pa Bele: «ae occlettniae Hod 
On the Calculus of Variations. By Mr. iaiwey Llalsre/sloisist~’« Bho's\elalsa teint 445 
Determination of the Thickness of Wall necessary to support a given ‘hale 
Big Win. Manure. ara topiwie das edie acon « cps sm ephanones de.0 way ss 4s yagi 448 
On a Preparation of Cinchona. By Mr. Johnson............+++++++++- 451 
Chemical Description of Thorina, a new Earth. By Dr. Berzelius .... 452 
Magnetical and Meteorological Tables. By Col. Beaufoy ........-..... 460 
Analytical Account of the Philosophical Transactions for 1816.......... 462 
Proceedings of the Royal Society, May 1, 8, and 15........+5e++eeeee 463 
—\__————- Linnzan Society, May 6 ......... see cence eeeeeees 469 
Geological Society, Nov. 15, Dec. 6, 20, 1816; Jan. 
3,17, Feb. 21, March 7, and 21; 1817.......... eo wahtesraths dae> oaths 470 
—_—_ Royal Academy of Sciences .....02..ceseseccecsee 475 
Biotices of Lectures. .... 2.00. .avcsesecisssony anecicepast SERA ARSE eee 479 
Detail of Experiments relative to the Prevention of Explosion in the Oxy- 
hydrogen Blow-pipe. By Mr.Gray .....2......seceeeeenccscecewees ibid. 
Further Improvement in the Oxygen and Hydrogen Blow-pipe.......... 481 
MCLAREN ITIONIE 81a, s tevaitic’oiniciaie so elniv sipiersieisicie Meicinis's.« vie s(aisis's eta abi Sale 482 
Improvement in the Oxygen and Hydrogen Blow-pipe..........+..+.++5 438 
New Mineral Salt.............00. Gene v abisle Cama males Siaisiais gieina,s seis oocee Ibid. 
Death of Dr. Odier ...... Mae rete uicays ven hace airless Derisaiitsts sists cise 434 
Oe eee oe Mela siohe'sheis) divine ahlnakibn oinih pitas 485 
NE, TREREMINNED SaaS Se row cca eet then an pica ne since ntap aes ibid. 
Beemretettans for Mines... .. . cowasives sc aecceeseccess vases Seaganescs 486 
Experiments on Pendulum Vibrations at different Latitudes ........ sees 488 
Mr. John Stevenson, Oculist, &c......... ...see0e- Logen Ste Lala aipe\bueasies ibid. 
New Scientific Books inthe Press. 00.0... occas ccecceceececeeees ibid. 
Meteorological Table and Observations, April 8 to May 7...........+0. 489 
a Me nate bias Lone eiadiaiite dAddhdyx cddes'eva5 Kites sistaissalslsleis aero 
