Samuel Franklin Emmons 



plated were to be directed to the 

 determination (a) of the phenomena 

 of fusion, (5) of those of elasticity 

 and viscosity, and (i) of those of 

 heat conductivity, each considered 

 with special reference to their depend- 

 ence on temperature and pressure. 



The paper on " The Age of the 

 Earth," mentioned above, is his only 

 published result, and was but an ear- 

 nest of what he had planned to do. 

 This was an attempt to advance to 

 new precision Kelvin's estimate of 

 the Earth's age deduced from terres- 

 trial refrigeration. It consists mainly 

 of a mathematical discussion of the 

 Earth's thermal age as determined 

 from various postulates presented by 

 Laplace, Geo. H. Darwin and Lord 

 Kelvin, and based on Barus' deter- 

 minations of the latent heat of fusion, 

 specific heat, melted and solid, and 

 volume of expansion between the 

 solid and melted state, of the rock 



