xxx Annual Report of the Council. 



column, giving pressures up to 80 atmospheres, and afterwards 

 the shaft of a coal mine at St. Etienne, whereby he reached 430 

 atmospheres. These not sufficing, he devised forms of mano- 

 meter and piezometer, giving pressures up to 3,000 atmospheres. 

 The difficulties of such experiments are very great, since the 

 volume of a glass or metal vessel exposed to an enormous 

 pressure on one or both surfaces is not calculable by ordinary 

 methods, nor can the pressure itself be found without such 

 knowledge. There are also personal risks to be undergone, but 

 of these he took no account. 



His most important papers are Recherches sur la compressi- 

 bilite des gaz, de fair, et de Vacide carbonique ; Sur une forme de 

 la relation F(vpt) = relative aux gaz et sur la dilatation de ces 

 corps, a volume constant (Annales de Chimie et de Physique, 

 1883); Recherches sur P elasticity des solides et la compressibilite 

 du mercure (lb., 1891) ; and Memoir es sur Velasticite et la dila- 

 tabilite des fluides jusqti aux tres hautes pressions (lb., 1893). 



The gases upon which he worked were oxygen, hydrogen, 

 nitrogen, air, carbonic acid, and ethylene, and the liquids, water, 

 ether, alcohol, aldehyde, propyl alcohol, allyl alcohol, acetone, 

 ethyl chloride, ethyl bromide, ethyl iodide, carbon disulphide, 

 and phosphorus tri-chloride. His results were accepted without 

 question and have been quoted in text-books for nearly a quarter 

 of a century. 



Amagat was elected an honorary member of the Society in 

 1892; five years later the Royal Society made him a foreign 

 member, and in 1902 he became a member of the Academie 

 des Sciences. During the last few years he had retired from 

 work owing to ill-health, and he died early in March, at Saint- 

 Satur, in the Department of Cher. His nature is described as 

 sincere, kindly and modest. C. L. B. 



Mr. Nathaniel Bradley, J.P., F.C.S., who became a life- 

 member of the Society in 1889, died on the twenty-eighth of 

 January, 191 5. Mr. Bradley was apprenticed as a youth to a 



