EFACE. 



so that each one may decide for himself what degree of accuracy he shall 

 attribute to the properties and methods presented. 



The actual work of recomputing the Tables of Properties of S 

 and of constructing the Temperature Km ropy Table has been done 1>\ 

 Mr. Harold A. Everett, S.B., who has also read the proofs. How much 

 that means can be appreciated by those familiar with Mich undertakings. 



C. II. I'. 

 SEPTEMBER, 1907. 



