CONTENTS. vii 



Page 



Lieut.-Col. Miller's Description of a Shell, exploding by Per- 

 cussion when trod upon 358 



Mr. Kingston's Account of the Iron-Mine at Haytor, in De- 

 vonshire 359 



Mr. Mageough's Account of a new Method of mounting Ther- 

 mometers 365 



New Books : — Horsfield's Descriptive Catalogue of the Lepi- 

 dopterous Insects in the Museum of the East India Com- 

 pany — Haworth's Lepidoptera Britannica 368 — 370 



Proceedings of the Royal Society 370 



Linnaean Society 374 



, Astronomical Society 377 



at the Friday Evening Meetings of the Royal In- 

 stitution of Great Britain— Obituary : — Sir J. E. Smith 391 



New Minerals 397 



Meteorological Observations 398 



made at the Garden of the Hor- 

 ticultural Society at Chiswick, near London ; by Mr. Giddy 

 at Penzance, Dr. Burriey atGosport, and Mr. Veall at Boston. 400 



NUMBER XVIII.- JUNE. 



Mr. Walker on the Artificial Production of Cold 40 1 



On the Causes of Single and Erect Vision 406 



Mr. Ewart on the Reaction of EffluentWater, and on the Maxi- 

 mum Effect of Machines. With Notes relating to the Theory 



of Barker's Mill ; by Mr. Ivory 416 



Mr. ivory on the Figure of the Earth, as deduced from Mea- 

 surements of the Meridian 431 



M. Fayolle on the characteristic Equation of Curve-surfaces 



capable of being evolved in a Plane 436 



Proceedings of the Royal Society 436 



, Linnaean Society 440 



. Geological Society '. 441 



. 1 — Astronomical Society 451 



at the Friday Evening Meetings of the Members 



of the Royal Institution 456 



Origin of Trap Rocks 458 



Analyses of Tourmalines 460 



Prof. Stromeyer's New Method of separating Manganese from 

 Lime and Magnesia — Singular Action of Phosphoric Acid 



on Albumen 462 



List of Earthquakes which occurred in 1827 — Red Rain sup- 

 posed to arise from Butterflies 463 



Weather in Paris — MM. Dumas and Boullay's Analysis of 



Alcohol, Mther, &c 465 



Test of the Presence of Ammonia — New Patents 466 



Scientific Books — Meteorological Observations * 467 



Meteoro- 



