C. H. BEST 



searches were on shock, blood substitutes, nutrition, lighting, and the 

 development and application of new tests of vision, hearing, and fre- 

 quency discrimination. These were followed by attacks on the special 

 and \'ery numerous physiological problems associated with immersion 

 foot, cold and hot weather protective clothing, ventilation, diving, 

 underwater blast, etc. 



In spite of the extremely satisfactory progress made under war- 

 time conditions in many countries, a host of Service medical problems 

 remain unsolved at the end of the war. No attempt will be made 

 to list them here. An important matter of concern is that, in our 

 eagerness to return to peacetime medical research, we shall not forget 

 the years when we narrowly missed becoming hopelessly enmeshed in 

 the "coils of slack" that had been allowed to accumulate. 



438 



