560 High Temperatures and Pressures. [March 19, 



metals which have never been tried in this connection, and one or other 

 of them may turn out to have the requisite properties. 



I desire to acknowledge the assistance I have received in making 

 the experiments described from mj assistant Mr. C. H. Beasley, and in 

 examining the products from Mr. T. H. Waller. 



[R. T.] 



