i*78 Royal Academy oj Sciences of Paris. 



sented a work of his late father's On the direction of balloons. — M. 

 Paul Laurent presented a second memoir On new methods of engrav- 

 ing. — M. Imbert sent a description of a support with a segment of a 

 sphere for levelling, surveying, and geodetical instruments, followed 

 with a memoir On the improvement of the spirit-level. — A memoir 

 of M. Portal On putrid fevers was read. — M. Dutrochet read a me- 

 moir On the irritability of vegetables and animals. 



May 12.— M. Miquel sent a sealed packet containing a memoir On 

 urinary concretions, anil a new method of treating gravel.— M. Cag- 

 niard-Latour communicated an observation which he had made during 

 the course of his experiments on the vibrations of long brass wires. 

 — M. Nanningaof Embden informed theAcademy by letter that he had 

 found the true theory of the resistance of water. — M. Leymerie com- 

 municated some new views respecting the yellow fever. — M. Morlet 

 deposited a memoir On the form of the magnetic equator.— M. Reboul 

 transmitted a manuscript memoir on the geological structure of the 

 Pezenas basin. — The Academy afterwards heard— the remainder of 

 M. Portal's memoir On putrid fevers : — a memoir of MM. Audouin 

 and Milne Edwards on the aerial respiration of the Crustacea, and 

 the modifications which the branchial apparatus undergoes in land- 

 crabs : — a memoir by M.Julia Fontenelle On human combustion : — a 

 memoir of M. Benoiston de Chateauneuf On the former and present 

 wheat-harvests of France. 



May 19. — The Minister of the Interior announced that he had 

 given orders to substitute a marble bust of His Majesty, executed by 

 M. Bosio, for the plaster one which is now placed in the room for 

 public meetings.— M. Prony distributed a lithographic portrait of La- 

 grange. — M. Finot claimed the priority of invention in having substi- 

 tuted starch for isinglass in sizing paper. — M. Duchatel addressed a 

 supposed solution of the problem of the trisection of the triangle. — 

 The Academy afterwards heard— a notice by M. Beudant On the 

 specific gravity of bodies, considered as a mineralogical character: — 

 Observations on vegetable physiology by M. Du Petit-Thouars : — a 

 notice On the phenomena of terrestrial magnetism by M. Le Grand : 

 — a notice respecting the specific heat of the atoms of "simple bodies. — 

 The Commission named for the purpose, reported that there was no 

 opportunity to adjudge the mechanical prize this year j and the Com- 

 mission for the prize founded by Lalande, proposed to adjudge the 

 medal to MM. Carlini and Plana, authors of the second volume of a 

 work recently published at Milan On the measure of a terrestrial pa- 

 rallel : this proposal was unanimously adopted. 



May 26. — Mr. Warden gave some details respecting an earthquake 

 felt at Washington on the 9th of March last, between ten and eleven 

 in the evening. — M.Thounsendsent Observations on the yellow fever. 

 — M. Lenoir requested that the platform which he had constructed for 

 the division of astronomical and geodetical circles, might be examined. 

 — M. Desfontaines, in the name of a Commission, gave a very favour- 

 able account of the work which M. Cambessedes had presented On the 

 families ternstroyniacece et guttifercc. — M. Poisson read a memoir on 

 some points of the Mfcamque Ce'leste. 



LXV. /«- 



