1824.] Proceedings of Philosophical Societies. 227 



dour, and for the trouble he has taken in pointing out our 

 errors. We hope they are not unpardonable. 



A. B. is right as to the transposition of the two salts of iron. 

 It should be 1 grain in 66 of ferrum ammoniatum, and 1 in 1-2 

 of ferri subcarbonas. 



The erratum respecting nitric oxide has been already marked 

 for correction. The third error, if one, does not originate with 

 us ; the article is copied verbatim from the Journal of Science. 

 — C. 



Article XIV. 



Proceedings of Philosophical Societies. 



ROYAL ACADEMY OF SCIENCES OF PARIS. 



The Royal Academy of Sciences of Paris not having adjudged 

 the prize proposed in 1822 to any of the memoirs delivered in, 

 decreed in the sitting on the 7th of June last, that thy same 

 subject shall be proposed afresh for the prize for 1826, viz. 



1. To determine by multiplied experiments the density which 

 liquids, particularly mercury, icater, alcohol, and sulphuric ether, 

 acquire by pressures, equal to the weight of several atmospheres ; 

 and 



2. To measure the effects of the heat produced by those pres- 

 sures. 



The prize is a gold medal of the value of 3000 francs. 



The subject for the mathematical prize for 1826, is, 



A method for calculating the disturbances of the elliptical motion 

 of comets, applied to the approaching return of the comet of 1759, 

 and to the motion of that observed in the years 1805, 1819, and 

 1822. 



The prize is a gold medal of the value of 3000 francs. 



Both these prizes will be adjudged in the public sitting on the 

 first Monday in June, 1826 ; and the memoirs must be sent in 

 before the 1st of January of that year. 



The subject for the prize in the class of natural history, for 

 1825, is, 



To determine by a series of chemical and physiological experi- 

 menls, the nature of the phenomena which successively occur in, the 

 digestive organs, during the process of' digestion . 



The candidates will first ascertain the chemical, or other 

 modifications which the immediate organic principles undergo 

 in the digestive organs, particularly those which enter into the 

 composition of food, as gelatine, albumen, sugar, &c. 



Their researches will next be directed to the alimentary sub- 

 stances themselves, in which several immediate principles are 

 united, carefully distinguishing between liquid and solid aliments. 



Q 2 



