68 Mr. Moore on a simple Method 



the operations of war in the West Indies." — MM. Legendre 

 and Mathieu gave an account of M. Puissant's memoir On 

 the determination of the figure of the earth by geodesic and 

 astronomical measurements. — M. B. de Chateauneuf 's me- 

 moir On the influence of vaccination on the increase of popu- 

 lation in France and in Paris, was referred to a committee. — 

 M. Vicat read a memoir, entitled, New facts leading to the 

 theory of calcareous cements. 



Jan. 9. — M. Pailhes presented a table of the heights of the 

 tides, measured at the bridge of the Tournelle, during the 

 year 1 825. — M. Jomard presented a collection of plants and 

 vegetable productions which had been sent him by the late 

 M. de Beaufort. — M. G. St. Hilaire presented a human mon- 

 ster, which had been found, embalmed, among the mummies 

 brought from Egypt by M. Passalacqua; and he read a notice 

 on the subject. — MM. Deyeux and Du Petit Thouars gave a 

 favourable report on M. Granier's memoir relative to the oil 

 he has extracted from the grains of the wild cornel-tree, called 

 Savignon. — M. Girard read a notice on a new canal executing 

 in the United States, between the Erie canal and Hudson's 

 river. — M. Dureau de la Malle, of the Academy of Inscrip- 

 tions, read an extract from a work on the Censorship among 

 the Roman citizens from the time of Servius Tullius to that 

 of Justinian. — M. Dumas read a memoir on proto-phosphu- 

 retted hydrogen. — M. Vicat communicated a new memoir on 

 mortars. 



Jan. 16. — M. Girard communicated a note on the theory 

 of heat, and of chemical phenomena. — MM. Gay-Lussac, 

 Dulong, Arago, De Laplace, and Fresnel, were appointed a 

 committee to examine the memoirs received in competition for 

 the prize for the best paper on the constitution of vapours. 



X. Intelligence and Miscellaneous /Lrticles. 



A SIMPLE METHOD OF GRADUATING GLASS HYDROMETERS. 

 BY CHARLES MOORE, ESQ. 



A S hydrometers of glass are irregular in shape, they are 

 ^*- usually graduated by immersing them in fluids of different 

 specific gravities. But as a considerable number of fluids are 

 required, and as they are liable to change by evaporation, a 

 different method may be found useful. 



In trying the specific gravities of fluids by a bottle of known 

 capacity, we compare together the weights of equal volumes ; 

 but in using a hydrometer we compare the volumes of equal 

 weights ; as the instrument sinks until it displaces a volume 



of 



