Intelligence and Miscellaneous Articles. 



553 



ence of temperature between the high- and low-pressure sides of a 

 porous plug through which elastic fluids were forced. Our experi- 

 ments were then limited to air and carbonic acid. With new appa- 

 ratus, obtained by an allotment from the Government grant, we have 

 been able to determine the thermal effect with various other elastic 

 fluids. The following is a brief summary of our principal results at 

 a low temperature (about 7° Cent.) . 



Further experiments are being made at high temperatures, which 

 show, in the gases in which a cooling effect is found, a decrease of 

 this effect, and an increase of the heating effect in hydrogen. The 

 results at present arrived at indicate invariably that a mixture of gases 

 gives a smaller cooling effect than that deduced from the average of 



the effects of the pure gases. - 

 Society for June 14, 1860. 



-From the Proceedings of the Royal 



ON THE TEMPERATURE OP WATER IN THE SPHEROIDAL STATE. 

 BY C. MARIGNAC. 



M. Boutigny's experiments have led to the conclusion that the 

 temperature of bodies in the spheroidal state is constant, and is 

 somewhat below the boiling-point of the body. That of water is 

 96°*5. Other experimenters, however, have not found so high a 

 temperature. 



M. de Luca* considers that the direct determination of the tem- 

 perature of water in the spheroidal state, by means of a thermometer 

 immersed in the spheroid, is liable to serious errors. He has esti- 

 mated it by means of a coloured solution, which becomes decolorized 

 at a certain temperature. He used for this purpose iodized starch, the 



* Comptes Rendus, July 23, 1860. 

 Phil Mag. S. 4. No. 136. Suppl. Vol. 20. 



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