572 



The Saïpluite.s of LWuuiik Sodium, Potas.smin. Rubidium and 

 Caesium; the yitrate.s of Litkiuni, Sodiam, Potassium, Rubidium and 

 Caesium; the Afetaborates of Lithiam, Sodium and Potassium; and 

 the Molybdates, T'ungstates and Metaphosphates of Sodium and 



With the exception of rubidinnisiilfate, which evidently contained 

 ^sorae potassiumsnlfate, all salts were chemically pure; the sulfates, 

 molybdates and tungstates were those commonly used in this laboratory 

 for the calibration of the thermoelements, and just the same was 

 the case with lithiummetaborate. For the metliod and practice of the 

 measurements etc., we can refer to the foregoing communication. 



h 2. 



