438 PROCEEDINGS OF THE AMERICAN ACADEMY, 



a recomputation from the data of others, using in this recomputation 

 some of the improved values found here. These new quantities are: a 

 more accurate vahie for the density of the solid at —38°. 85, a rough value 

 for the thermal dilatation and the compressibility of the solid, an im- 

 proved value for the specific heat of the solid, the electrical resistance 

 of the liquid up to the freezing pressure, and the resistance of the solid 

 under pressure, including the pressure and the temperature coefficients. 



Finally, the computations made necessary the determination of 

 another quantity of interest in itself, namely, the compressibility of 

 steel. This was determined up to 10,000 kgm. and at two temper- 

 atures, from which the temperature coefficient of compressibility is 

 found. 



Acknowledgement is here made of several liberal appropriations 

 from the Riimford Fund of the American Academy of Arts and 

 Sciences with which the expenses of this investigation were partially 

 defrayed. 



Jefferson Physical Laboratory, 



Harvard University, Cambridge, Mass. 



October, 1911. 



