n CONTENTS. 



Page 

 XIV. Contributions to Physical Geography, ... 25)9 



1. Account of an extraordinary Aralanche in the White iVfoun- 

 tains of New Hampshire, which took place on the 28th August 

 1826. By Professor Silliman, Rev. C. Wilcox, and Mr 



T. Baldwiit, ..... ib. 



2. Account of Earthquakes on the Mississippi, . . 31) 



3. On the Motion of Large Stoner, &c. in Lakes and Ponds. By 



Mr N. Chissman, . . . . 313 



XV. Additional Remarks on Active Molecules. By Robert Brown, 



F.R.S. . . . . . 314 



XVI. Account of the extraordinary talent for calculation of Vincenzio Zuc- 



C3T0, a child seven years old, . . . . . 320 



XVII. A description of a Microscopic Doublet. By Willtam Hyde 



WoLLASTON, M. D. F. R. S. &c. . . . 323 



XVIII. An account of the preliminary experiments and ultimate construction 

 of a Refracting Telescope of 7'8 inches aperture, with a fluid concave 

 lens. By Peter Barlow, Esq. F.R.S. &c. . . 328 



XIX. On the Mode of Generation in the Mya Pictorum — in the Helix pa- 

 lustris — and in the Mulus gobio ; and Notice on the Circulation of 

 the Foetus in Ruminating Animals. By M. Prevost of Geneva, 334 

 XX. Account of a new Cistern ^or Barometers. By Mr John Adie. 



Communicated by the Author, . . 338 



XXI. HISTORY OF MECHANICAL INVENTIONS AND OF PRO- 

 CESSES AND MATERIALS USED IN THE FINE AND 

 USEFUL ARTS, . . 340 



1. Mr Sevan's Experiments on the Modulus of Torsion, . ib. 



2. Results of Mr Rennie's experiments on the friction and abrasion 



of the surfaces of Solids, . . . 343 



3. On an Indelible Ink. By M. Henri Braconnot, . 344 



4. Method of detecting the Adulteration of Flour with Potatoe Flour. 



By M. Henri, ..... 345 



6. Description of Mr Fowler's Patent Thermosiphon, . ib. 



6. Mr Derbyshire's Embrocation for preventing or alleviating sea- 

 sickness, .... . . 349 



7. Metliod of preserving Fruit without Sugar, . . ib. 



XXIL ANALYSIS OF SCIENTIFIC BOOKS AND MEMOIRS, 350 



1. Principles of Natural Philosophy, or a new Theory of Physics, 

 founded on Gravitation, and applied in explaining the general pro- 

 perties of matter, the phenomena of Chemistry, Electricity, Galva- 

 nism, Magnetism, and Electro-magnetism. By Thomas Exley, 

 A. M., Associate of the Bristol Philosophical and Literary Society^ 

 Lond. 1829. Pp. 510, and 4 Plates, . . 350. 



2. The Natural History of several new popular, and diverting living 

 objects for the Microscope, with the phenomena presented by them 

 under observation, &c. Conjoined with accurate descriptions of the 

 latest improvements in the Diamond, Sapphire, Aplanatic, and 

 Amician Microscopes: And Instructions for managing them, &c. 

 &c • To which is added a Tract on the newly discovered Test ob- 

 jects. Illustrated by highly finished coloured Engravings from 



