M. Darondeau's Experiments on Sea-Water. 167 



the oxygen of the carbonic acid, form with its nitrogen an air 

 which differs exceedingly little from that of the atmosphere. 



Some Experiments which were made on hoard La Bonite, 



In an experiment made on the 12th September 1836, in the 

 Pacific, at 16° 53' N. lat. and 118° 13' W. long, with water ta. 

 ken from a depth of 380 fathoms, it was found to contain 1.62 

 parts of gas for every 100 parts of water ; the gas was not 

 analyzed. In this experiment the vessel contained 9066 cubic 

 centimetres of air, whose volume reduced to the freezing point 

 of temperature, and a pressure of 2280 feet, gives, having re- 

 gard to the capacity of the apparatus, 6.48 parts of air for the 

 100 parts of water taken at the depth of 380 fathoms. 



On the 21st November 1836, in the Strait betwixt the Ma- 

 rianne and Phillipine Islands, in 18° 22' N. lat. and 132° 13' 

 E. long, the apparatus was sunk to the depth of 300 fathoms ; 

 the water from this depth contained 2.20th parts of air in every 

 100 parts of water ; whilst the water taken at the surface in 

 the same Strait contained 2.27ths ; the bladder contained only 

 a very small quantity of air. 



Finally, on the 29th November, in the China Sea, in sight 

 of the Island of Lu9on, in 18° 0' N. lat. and 117° 30' E. long, 

 the instrument having been sunk to a depth of 300 fathoms, 

 the bladder was found to contain 55 cubic centimetres of air, 

 which, at 0° and 760 of the barometer, gives 3.89 parts for 100 

 parts of water taken from this depth. — Comptes Rendus, 30# 

 Avril 1838. 



Observations on the Electric Origin of Metalliferous Veins. By 



M. BECaUEREL.* 



Mr Fox remarks, that, if we consider the electrical relations 

 of the different metallic ores in a geological point of view, we 

 observe, that almost all those which are generally associated in 

 the same veins agree in the particular, that their reciprocal vol- 

 taic action is, for the most part, very small. Hence he infers, 



• Traite Experimental de I'Electricite et du ISIagnetisme, tome v. p. 167, 

 174. The notes marked W. J. H. were furnished by Mr Henwood, to whom, 

 also, we are indebted for this translation. 



