CONTENTS. Vii 



Page. 



Art. XXIV. — On certain Combinations of a New Acid formed of 



Azote, Snlphur, and Oxygen. By J. Pelouze 470 



Art. XX V^ — An Attempt to explain the Abiorption of Light ac- 

 cording to the Undulatory Theory. By Baron Fabian von 

 Wrede 477 



PART IV. 



Art. XXV. — {continued.) 483 



Art. XXVI. — On the Application of Electro-Magnetism to the 

 Movement of Machines. By M.H. Jacobi, Doctor of Science, 



and Professor at the University of Dorpat 503 



Note on the Application of Electro-Magnetism as a Mechanical 

 Power. By I. D. Botto, Professor of Natural Philosophy in 



the Royal University of Turin 532 



Part of a Lecture on Electro-Magnetism, delivered to the Phi- 

 losophical Society at Zurich, February the 18th, 1833. By the 



late Dr. R. Schulthess 534 



On the Influence of a Spiral Conductor in increasing the Inten- 

 sity of Electricity from a Galvanic Arrangement of a Single 



Pair, &c. By Professor Henry, of New Jersey, U. S 540 



Art. XXVII. — A singular case of the Equilibrium of Incompres- 

 sible Fluids. By M. Ostrogradsky 548 



Art. XXVIII — On the Origin of Organic Matter from simple 

 Perceptible Matter, and on Organic Molecules and Atoms ; 

 together with some Remarks on the Power of Vision of the 



Human Eye. By Prof. C. G. Ehrenberg 555 



Art. XXIX — On the Application of Circular Polarization to Or- 

 ganic Chemistry. By M.M. Biot and Chevreul 584 



On the Application of Circular Polarization to the Analysis of 



the Vegetation of the Gramineae. By M. Biot 584 



Examination of an Optical Character, by which, according to 

 M. Biot, Vegetable Juices capable of producing Sugar ana- 

 logous to Cane Sugar, and those capable only of producing 

 Sugar similar to Grape Sugar, may be immediately distin- 

 guished. By M. Chevreul . 591 



On the Application of the Laws of Circular Polarization to the 



Researches of Chemistry. By M. Biot 600 



Art. XXX. — On the Laws according to which the Magnet acts 

 upon a Spiral, when it is suddenly approached to or removed 

 from it ; and on the most advantageous Mode of constructing 

 Spirals for Magneto-Electrical purposes. By E. Lenz .... 608 



