142 Proceedings of Philosophical Societies. [August, 



filled with coloured fluids, like those which ornament the shop 

 windows of druggists, would, in all probability, answer the end 

 at a much less expense. 



M. Gillet de Laumont stated that lithion occurs much more 

 abundantly in the triphane than in the petalite. 



M. Beauvois read a description of an aggregation of stones 

 observed in the United States, and known by the name of the 

 natural wall. 



M. Geoffray-Saint-Hilaire continued the reading of his memoir 

 on the Pulmonary Organs. 



M. Constantio, a Portuguese physician, read a memoir, in 

 which he attributes a very marvellous effect to a certain balsam 

 invented by M. Malati, a Spanish physician ; which was 

 referred to a committee. 



April 13. — M. Moreau de Jonnes read a memoir on the Calca- 

 reous Islands of the West Indies. 



A series of observations by M. Dupetit-Thouars on the Effect 

 of Frost on Vegetables, was referred to a joint committee of 

 botany and agriculture. 



M. Girard read a report on a machine invented by MM. 

 Lacroix and Peulvay, a model of which was presented to the 

 Academy. 



April 20. — A sealed packet containing theoretical views on 

 certain phenomena of light, by M. Fresnel, was deposited with 

 the Academy. 



M.Rebours presented a new instrument, called hy him. micro- 

 telescope; which was referred to a committee. 



M. Pelletier read a memoir on Cochineal. A bed for the use 

 of women in labour invented by M. Rouget was referred to a 

 committee of Surgeons. 



The continuation of " Meteorological Observations made at 

 Alais, during the year 1817, by M. Hombres-Firmas," was read. 



April 21. — M. Rauzon de Passan sent a new letter on the 

 Theorem of Archimedes respecting the ratio of the cylinder and 

 the inscribed sphere ; referred to a committee. 



M. Painsotread a memoir on the theory of numbers, entitled 

 " An Analytical Representation of the Remainders of Powers, 

 by the Formula of imaginary Roots of Unity." 



M. Julien-le-Roi presented the description of a carriage 

 invented by him ; referred to a committee. 



M. Richerand read a memoir on a successful operation, in 

 which portions of three ribs were removed, and the pleura was 

 wounded. 



M. Dellile's memoir on the Date Palm, cultivated in Egypt, 

 was referred to a committee. 



M. Colin presented an instrument of his invention for the 

 purpose of facilitating the circular incision recommended for 

 curing the bleeding of the vine. 



A memoir was read, by M. France, on the Shells composing 

 the Genus Cabochon. 



