R.A.F. This included visits to the R.A.F. units in Western Germany. While in Germany special arrangements were made, through the courtesy of the Air Surgeon, to visit all the U.S.A.F. units and medical installations. Service and civilian Aero Medical Laboratories were also visited in Holland, Belgium and France. Particularly interesting was the demonstration in Holland of the Mobile Blood Laboratory which, in a self-contained unit, processes blood from the donor to the dried serum and other end products. Throughout the visit detailed studies were made of the interesting research projects in aviation medicine and the physiology of flight and also on all aspects of air evacuation. The fourth Civil Medical Examiners' course was held during October at the Institute of aviation Medicine, Toronto. These courses are given under the guidance of Dr. H. E. Wilson, Chief, Civil Aviation Medicine, Department of Transport, in cooperation with the R.C.A.F. Several Air Force Medical Officers lecture to the Medical Examiners during each course.