U CONTENTS. 



Page 

 Contributions to the Physiology of Vision, No. I. . . .101 



Description of the Horns of the Prussian Elk ; Difference between 

 them and those of the American Moose-Deer. By WILLIAM 

 WITTICH, Esq. . . . . . .118 



On Gunpowders and Detonating Matches. By ANDREW URE, 



M.D., F.R.S., &c 121 



ANALYSIS OF NEW BOOKS. 



Commentaries on the Mining Ordinances of Spain. By Don Fran- 

 cisco Xavier de Gamboa. Translated by RICHARD HEATH- 

 FIELD, Esq., Barrister- at-Law . . . 142 



Anatomical Investigation of the Structure of the Eyes in Insects and 

 Crustacea, by Dr. J. Miiller . . . .152 



On the Structure of the Eyes in the Murex Tritonis. By Dr. J. 

 Miiller . 155 



FOREIGN AND MISCELLANEOUS INTELLIGENCE. 



I. MECHANICAL SCIENCE. 



1. Resistance opposed to Water moving in Pipes (D'Aubuisson) . 157 



2. On the Resistance of Lead to Pressure, and on the Influence of a small 



Quantity of Oxide upon its Hardness . . ib. 



3. On the Power of Horses (B. Bevan, Esq.) . . .159 



4. On the Change of Volume occurring when Bodies combine together 160 



5. Apparent Hydrostatic Anomaly with Laurel-oil . . 161 



6. On the Quantity of Light reflected by Metallic Specula at different 



Angles of Incidence (R: Potter, Esq.) . . .162 



7. On the apparent Projection of Stars upon the Moon's Disk . 163 



8. On the Production of Coloured Bands by Plane Mirrors . 164 



9. Size for Illuminators, Artists, &c. . . . 165 



II. CHEMICAL SCIENCE. 



1. Galvanic Currents during the Decomposition of Water . 166 



2. Power of Metallic Rods or Wires to decompose Water, after their con- 



nexion with the Galvanic Pile is broken (Berzelius) . 167 



