202 ANNUAL REPORT SMITHSONIAN INSTITUTION, 19 3 9 



other fields of science and also to industry suggest themselves imme- 

 diately, though our time is too short to consider them. If nothing 

 emerged from nuclear studies but this one technique, I doubt if the 

 present equipment in all the laboratories in this country would be 

 adequate to supply the radioactive material for the applications 

 that will develop within the next few years. We are midertaking 

 this type of work at the University of Pennsylvania to the extent 

 that our rather limited funds permit, and we are convinced that 

 this vast unknown field has even more important possibilities in store 

 for us. We hope that we shall be able to interest sufficient support 

 not only to contribute this technique to physics and our sister sciences, 

 but to go on and explore the very promising field of the nucleus 

 with every confidence that the understanding gained thereby will 

 lead to still more important developments in the future. 



