Determination of Temperatures with the Meldometer. 365 



Salts of Potassium, 



Meyer, 

 Ramsay & Le Cba- Riddle Heycock & 



Eumorfopoulo9. Carnelley. telier. & Lamb. Neville. McCrae. 

 K 2 SO*... 1052 ... 1045 1078 1066-5 1059(1166) 



K 2 C0 3 ... 880 834 860 879 ... 893(885) 



KC1 762 734 740 800 ... 800 



KBr ... 733 699 ... 722 ... 746(709) 



KI 614 634 640 685 ... 723(677) 



M. Le Chatelier gives an earlier value 1015° for potassium 

 sulphate, and also 885° for potassium carbonate. Our value 

 for potassium sulphate is 7 degrees above that of gold. 

 Messrs. Heycock and Neville's is 4*5 above their value for 

 gold, but they mention that there may be an error of 2 degrees, 

 due to the alkalinity of their potassium sulphate. 



Salts of Calcium, Strontium, and Barium. 

 The salts of calcium, strontium, and barium were prepared 

 from their carbonates precipitated from the purified nitrates. 

 Their melting-points are not well marked, especially those of 

 calcium ; and here again the iodides are less well marked 

 than the chlorides. 



Meyer, 

 Ramsay & Le Oha- Riddle McCrae, 



Eumorfopoulos. Carnelley. telier. & Lamb. 



Ca(N0 3 ) 2 499 561 



CaCl 2 710 719 756 806 802 



CaBr 2 485 676 



Oal 2 575 (?) 631 



Sr(N0 3 ) 2 570 645 



SrCP 796 825 840 832 854 



SrBr 2 498 630 



Sri 2 .. 402 507 



Ba(N0 3 ) 2 ... 575 593 592 



BaCl 2 844 860 847 922 916(941) 



BaBr 2 728 812 



Bal 2 539 



Calcium chloride is very difficult to observe, as it slowly 

 softens. We found it practically impossible to take the 

 melting-point of calcium iodide, as it is exceedingly hygro- 

 scopic, and, on heating, it is almost immediately oxidized. 

 We do not think it can be above the value given, though it 

 may be below it. 



Salts of Silver and Lead. 

 These were prepared by precipitation. Their melting- 

 points are well marked. 



Phil. Mag S. 5. Vol. 41. No. 251. April 1896. 2 C 



