RICHARDS. — TRANSITION TEMPERATURES OF SODIUM CHROMATE. 185 



the equilibrium temperature of the mixed deka- and hexahydrates. 

 With the Beckmann thermometer the new point was 1.039°. On the 

 Baudin thermometers all individual rea;dings were corrected for stem 

 exposure and averaged as before. 



Preliminary reading by Thermometer 15200 19.984° 



15276 19.990° 



The average 19.987° 



The material used in the final observations was the same as that 

 used for the previous final work, after conversion into a mixture of 

 deka- and tetrahydrate. With the Beckmann thermometer it gave the 

 transition point 1.039, the same as that given by the salt used in the 

 preliminary tests j ust recorded. 



Final Determination I. 



19.985° 



20.226° 0.154' 



Corrected reading in ice — -154 



20.072° 

 Cor. fundamental interval + .001 



20.073° 

 Cor. to hydrogen scale — .085 



19.988° 

 Total average of two final readings 19.987° ± 0.002 



