240 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1953 



need for technically trained people has never been greater. The op- 

 portunities have never been greater. 



We have hardly scratched the possibilities of scientific achievement. 

 I have no doubt that someone 25 years hence in presenting the Fiftieth 

 Faraday Lecture will tell us of things which even now are beyond our 

 remotest dreams. I hope, however, that I may be able to point to 

 some of these developments of the future and say that they were 

 made possible in part by isotopes — by what we now call new keys to 

 knowledge. 



Reprints of the various articles in this Report may be obtained, as long as 

 the supply lasts, on request addressed to the Editorial and Publications 

 Division, Smithsonian Institution, Washington 25, D. C. 



