552 



Intelligence and Miscellaneous Articles. 



ON THE DENSITY OF MIXTURES OF ALCOHOL AND WATER. 

 BY M. VON BAUMHAUER. 



The author has made a series of determinations of the density of 

 mixtures of alcohol and water. The alcohol was obtained from two 

 different sources, and was rectified first over dried carbonate of potash, 

 and then five times from burnt lime. Thus prepared, one of the 

 specimens had the specific gravity 0'7946 at 15° C., and the other 

 0*7947 at -the same temperature. This number agrees with that 

 found by Pouillet for absolute alcohol prepared by Fremy, and was 

 not changed by further rectification. The mixtures were made in 

 carefully graduated tubes at 15°, and the distilled water was freed 

 from air by continued boiling and cooling in vacuo. The alcohol 

 and the water were weighed as a control. The results were reduced 

 to water at its greatest density. They are collated with those ob- 

 tained by Pouillet, from which they are seen to differ materially. 



Comptes Rendus, vol. 1. p. 591 



ON THE THERMAL EFFECTS OF FLUIDS IN MOTION. 

 BY DR. JOULE AND PROFESSOR W. THOMSON. 



In our paper published in the Philosophical Transactions for 1854, 

 we explained the object of our experiments to ascertain the differ- 



