206 Miscellanies. 



particular kind of compound, to which they gave the name of ammo- 

 niacal azoturet of potassium ; although this name expresses a partic- 

 ular mode of combination, still, the experiments of the French chem- 

 ists do not determine, with sufficient exactness, the elementary com- 

 position of this substance, especially, as these experiments, when re- 

 peated by Davy, furnished different results. 



New experiments, conducted with all the precision belonging to 

 the present state of the scifence, are demanded, in relation to the am- 

 moniacal azoturet of potassium. These experiments should be pre- 

 faced by an expose of those of Gay-Lussac and Thenard and of 

 Davy. References should also be had to what is stated on this sub- 

 ject in the second volume of the French edition of Berzelius's Chem- 

 istry. 



The authors of the memoir, after having determined with precision, 

 the elementary composition of the subject of his experiment, will try 

 to elucidate the mode of combination which appears most probable 

 to express the nature of the substance analyzed. 



The pieces should be sealed and they may be written in Russian, 

 German, French or Latin, and addressed to the perpetual secretary 

 of the Academy, before the first of August, 1834. The prize of one 

 hundred Dutch Ducats, will be decreed in the public sitting, to be 

 held on the 29th of December of the same year. The successful 

 piece will be printed at the expense of the Academy. 



21. Dr. Young's Elements of Geometry, &fc. &fc. — "The Ele- 

 ments of Geometry," — " The Elements of the Differential Calculus," 

 — and " The Elements of the Integral Calculus," by Dr. Young, 

 have been presented to the public by Carey, Lea and Blanchard, in 

 three octavo volumes. They are designed for the use of Colleges 

 and Universities, and contain full elementary expositions of the sub- 

 jects of which they treat. 



It is the author's plan to give a larger and more comprehensive 

 view of Geometry, than has been done by 'any preceding geometer ; 

 and it is his aim to adhere to that accuracy of reasoning, and rigor of 

 proof, in his geometrical investigations, which shall not leave conclu- 

 sions " only approximately true," but shall establish every proposi- 

 tion by demonstrating the converse where demonstration is possible, 

 pointing out " those cases where it necessarily fails." This mode of 

 proceeding must be highly satisfactory to the learner, who thus not 

 only ascertains, that " under certain conditions a certain property 



