and on the Isomeric Modifications of Selenium, 503 



was made by placing it in naphtha in the calorimeter. The 

 results are as follow : — 



Chloride of lithium . 62^^-030 82gr-100 



Tin 2gr-155 2gr-365 



T 96°-69 97°-01 



& 12°-88 13°'79 



Al9' 8^-9338 ll°-6339 



I did not endeavour to determine directly the specific heat of 

 chloride of lithium from the quantity of heat acquired by the calo- 

 rimeter charged with naphtha. 1 preferred to compare it directly 

 with that of chloride of sodium placed under exactly the same 

 conditions. I cast therefore melted chloride of sodium in the 

 same mould, folded it in tinfoil, and determined its calorific ca- 

 pacity with the calorimeter charged with the same quantity of 

 naphtha. The following is the table of results : — 



Chloride of sodium . 79«^-410 69^-330 \ 



Tin lg'--895 l^'-'SSS 



T 98°-09 97°-31 



& 13°-28 15°-85 



A(9' 8°-7369 7°-3532 



The specific heat of chloride of sodium was found to be 0*21401 

 in my former experiments [Ann. de Chim. et de Phys. 3rd series, 

 vol. i. p. 154). By introducing this value into the two determi- 

 nations, the elements of which I have just given, we can calcu- 

 late the value in water of the calorimeter charged with naphtha ; 

 we find thus, — ii:i/ >^/. 



According to experiment No. I. . . 166*03 -'f'^i'-'j 



II. . . 166*44 =■'•*'''• 



Mean .... 166*24 !!!^.|;/-i^ 



The two experiments on chloride of lithium, calculated with 

 this element, give for the specific heat of this body, — 



According to experiment No. 1. . . 0*28096 *' 



11. . . 0*28331 i;" 



Mean .... 0*28213 "^ 



The product of this specific heat by the atomic weight 524*90, 

 usually attributed to chloride of lithium, is 148*09. Now we 

 have found for this product, with the chlorides R^ Cl^, — 



Chloride of potassium .... 161*19 , . 



Chloride of sodium 156*97 



The number obtained for chloride of lithium is obviously less ; 

 but the difference is in that sense in which it might be presup- 

 posed; for we may remark in general, \\i?ii for bodies of the same 



