CONTENTS. 
V 
I’uge 
Professor E. Hodgkinson on the Defect of Elasticity in Metals subject to 
Compression ... 
Mijor.General Sir Charles W. Pasley on simplifying and improving our 
National Measures, Weights and Money. .. ;••• 
Professor Walker's Report of Aueniometrical Obsurvatiouu at Oxford during 
two Years . . . ... .. .. . 
CHEMISTRY. 
Dr. N. Aunott on the Regulation of Combustion ... 
•Mr. Charles Brooke on some Phenomena of Photography . 
Dr. W. B. Carpenter on Photography applied to Microscopic Objects . 48 
M. ClaL'uet on different Properties of the Solar Radiations which have per¬ 
meated Coloured Media, in influencing the conditions of Daguerreo ype 
Plates, BO as to receive or reject Mercurial Vapour. .. 
Pfofe«»or Connell on the Precipitate caused in Spring and River Waters by 
Aci-ute of Lead . . . ... .. . .. . .. 
-on Sulphatn-Chloride of Copper—a new Mineral. 49 
Professor Daubbnv on the Nutritive Value of different kinds of I'ood . 49 
Mr. John Goooman on a new and practical Voltaic Battery ol the highest 
powers in which Potassium forms the positive element . ... 
Dr. (Jrbbne on a Property of Alcohol . . . ^ ^ 
Mr. R. Hont on the Coloured Glass employed in glazing the new Palm onse 
Dr- Romnbon on the Electrolysis of Water (in a letter to W. R. Grove, Ksq.) 52 
Mr. W. R. Grove on the Quantity of Electrolysis as affected by the extent of 
the Sectional Area of the Electro!.. . 
Mr. J. p. Jocle on the Mechanical Equivalent of Iloat, as4etermined by the 
MAcrAtUE on the Directions of Plants as influenced by Light. . y 55 
Mr. Nbvil S. Mabkelynb on the bearings of Photography on Chemical Pbi- 
losciphy .. . 
^f. Mulder on Protclac and its Compounds . ... 57 
Dr.pRHuY on a specimen of artificial Humboldritc or Melilite in large Crystals 57 
^ ' — on a new Potash Apparatus for Organic Analysis......... 
• L. Pi.AYi'AiH on Decompositions produced by Catalytic Bodies, an on t e 
Molecular Constitution of Salts . ‘ 
^ D. Reade on two new Salts of Gold..... 
pj on Sugar from Potatoes . .. 
®f- ScHiisBBiN on a peculiar Formation of Pennanganic Acid .... 
y ' 0 “ the Products of the Decomposition of Chrysamraic Acid . 
Dr n^" ^^ Principle of Crystallization. 
8 \ Bii on Biliary Concretions . . ..'*n a*. 50 
^ * on the Analyses of the Inorganic Constituents of Orgamc o les.. 
PiL’ 11*^’ Ward's Experiments on CryBtullization under extreme Pressure..... 
• '’**'■ on the Inorganic Constituents of Root Crops.r r/Tn:.! 
Wetteustrut on tlie Preservation of Metals ® ^ 
^ttbinations from Oxidation, Decomposition and Injury from Marine De 
I’osita and Incrustations . 
geology and physical GEOGRAPHY. 
sifli. “ ^ remarkable Movement of the Sulden 
of the Ortlcr Berg, in the years 1815 - 16 , and also m 1845-46 . 
