Foreign Literature and Science. 181 



This important discovery is due to M. Clements, and is one 

 of the finest results of his numerous investigations. 



Second Law. — The volume of the same quantity of steam, 

 is in inverse proportion to the pressure to which it is subjected. 

 This law, discovered by Mariotte, is applicable to all gases. 

 Steam acts, in many respects, as a permanent gas. 



Third Law. — The dilatation of steam is g^ T of its volume 

 at zero, for each degree of the centigrade thermometer. We 

 are indebted for this law to the remarks of Gay Lussac and 

 Dalton. 



Fourth Law. — The latter gives the elastic force of steam, 

 according to the degree of heat at which it is produced. 

 The following table exhibits this law, which can be expressed 

 only by numbers. 



Pressure. Centigrade. Difference. 



1 Atmos. - - 100° ... 



2 122 - - - 22 

 3 

 4 

 5 



7 

 &c. 



34. Cyanuret of Iodine. — To obtain this substance in a 

 manner as curious as commodious, place upon a large square 

 of glass, a very large bell or receiver, of the same material ; 

 and on another side, a mixture in the requisite proportions of 

 cyanuret of mercury and iodine is to be heated in a porcelain 

 capsule until the cyanuret is plainly beginning to form. The 

 capsule is then to be expeditiously placed under the bell and 

 the operation abandoned to itself; when the production of 

 cyanuret of iodine will continue during 15 or 20 minutes, 

 presenting the spectacle of a multitude of flakes of snow, ex- 

 tremely light and of a dazzling whiteness. 



Annals d,e Chimie. Jan. 1827. 



35. Ammonia in the rust of Iron. — It has been experimen- 

 tally ascertained by Chevallier, that ammonia not only exists 

 in the oxide of iron which is formed in situations exposed to 

 animal effluvra, but that it may be obtained from oxide arti- 

 ficially prepared, under such precautions as will exclude the 



135 





13 



145 



- 



10 



153 



- 



8 



160 



. 



7 



166 



- 



6 



&c. 





&c. 





Idem. 



Feb. 1827 



