102 THE NEW WORLD OF SCIENCE 



of performance. The impetus given to research by the quest 

 for emulsions of greater speed and sensitiveness has already 

 resulted in unexpected progress, and this research may be 

 relied upon to bring forth even greater improvements. The 

 addition of an entire new department aerial photography 

 is undoubtedly the greatest advance due to the war. It opens 

 up a new territory, and appears destined, quite apart from its 

 wide pictorial uses, to enormous usefulness in mapping. It 

 promises indeed quite to revolutionize our present methods of 

 charting the earth's surface. 



