52 ANNUAL REPORT OF THE Off. Doc. 



regret that space forbids that all can not be published. In select- 

 ing essay's for publication, we find numerous essays treating upon, 

 the same topic, all meritorious, yet space would forbid the publica- 

 tion of more than one essay upon a given topic. These papers are 

 placed upon file and kept for future reference. 



