OF THE NATIONAL RESEARCH COUNCIL 141 



An additional psychological contribution to the training 

 of intelligence officers was made by Carl Rahn, wholly inde- 

 pendently of the Psychology Committee. He prepared a 

 series of lectures and exercises for the men in the Intelligence 

 Section at Camp Grant. Each of the lessons included (i) 

 the statement of some important psychological principle; (2) 

 an illustration to clinch the point; (3) a statement of appli- 

 cability to scout and patrol; and (4) an exercise based upon 

 the practical work of the detail. The officers in charge of 

 this course at Camp Grant were of the opinion that the psy- 

 chological work could be incorporated largely in the training 

 course for men in the Intelligence Service. 



The Rahn materials were transmitted to the Psychology 

 Committee of the Research Council through James R. Angell 

 and the Chairman of the Committee forwarded them to Wat- 

 son, who at the time was in the service of the Division of 

 Military Intelligence. 



15. Psychological Assistajice to the Chemical Warfare Ser- 

 vice. — Dodge, Baird, and Dunlap assisted the Chemical War- 

 fare Service by a special investigation of problems referred 

 by that service and the preparation of reports and recom- 

 mendations. 



This work was initiated in response to an appeal from an 

 officer of the Chemical Warfare Service for assistance with 

 certain psychological problems connected with the tenancy 

 of the gas mask. The chairman of the Psychology Commit- 

 tee referred the matter to the subcommittee on Visual Proba- 

 lems. Dodge, of that committee, after preliminary analysis 

 of the situation, conducted certain special investigations and 

 submitted reports, the chief recomm.endations of which have 

 been embodied in the latest form of mask. The following 

 Introductory statements indicate the important character- 

 istics of the practical situation and the scope of Dodge's In- 

 quiry:^ 



"Except for a few sporadic experiments, the mental and 

 neuro-muscular effects of wearing a gas mask have not been 

 investigated. We know neither the effects of the mask as a 



^ See also Dodge's account of the gas mask inquiry, p. 1 20, above. 



