294 



Mr. J. B. Hannay. 



Observations, &c. {continued). 



Office of the Chief Signal Officer. Daily Bulletin of Weather 

 Reports. June to August, 1877. 4to. Washington 1879-80. 

 Annual Report of the Chief Signal Officer, 1879. 8vo. Wash- 

 ington 1880. The Office. 



Office of the Surgeon- General U.S. Army. Index- Catalogue of 

 the Library. Vol. II. 4to. Washington 1881. The Office. 

 West Point : — U.S. Military Academy. U.S. Geographical Surveys 

 west of the 100th Meridian. Vols. II- VI. 4to. Washington 

 1875-80. The Academy. 



Adams (A. Leith), F.R.S., G. H. Kinahan, and R. J. Ussher. Explo- 

 rations in the Bone Cave of Ballynamintra, near Cappagh, 

 county Waterford. 4 to. Dublin 1881. The Authors. 



Campin (Francis) The relative merits of Vacuum and Air Pressure 

 Brakes. 8vo. Leeds 1881. The Author. 



Saint-Lager (Dr.) Nouvelles Remarques sur la Nomenclature Bo- 

 tanique. 8vo. Paris 1881. The Author. 



Struve (Hermann) Fresnel's Interferenzerscheinungen theoretisch 

 und experimentell bearbeitet. 8vo. Dorpat 1881. The Author. 



Todd (D. P.) Report on the Total Solar Eclipse of 1878. 4to. 

 Washington 1880. On the Use of the Electric Telegraph during 

 Total Solar Eclipses. 8vo. Observations of the Transit of 

 Mercury, 1878. May 5-6. 8vo. And three Reprints from the 

 American Journal of Science. The Author. 



" On the Limit of the Liquid State." By J. B. Hannay, 

 F.R.S.E., &c. Communicated by Professor G. G. Stokes, 

 LL.D., D.C.L., &c, Sec. R.S. Received February 22, 1881. 

 Read March 10, 1881. 



The uncertainty which characterises our knowledge of the true con- 

 dition of a fluid immediately above and below the critical temperature, 

 induced me to enter into a full examination of various fluids, with the 

 object of gaining accurate definitions of the liquid and gaseous states, 

 as well as to arrive at a true conception of the state of matter to which 

 the term vapour can be applied. In a former paper, which the 

 Royal Society has honoured me by publishing,* experiments were 

 detailed which seemed to show that the liquid state terminated at the 

 critical temperature, and that no amount of pressure would suffice at 

 any higher temperature to render the fluid capable of exhibiting 



* " On the State of Fluids at their Critical Temperatures." " Proc. Boy. Soc," 

 vol. 30, p. 484. 



