of the prominent achievements in the making of documentary films, but provided the subject matter for a series of lectures within the United States and Europe. A little known fact was that a considerable amount of footage was taken with cameraman Von Hoffman looking toward the' rear of the camera. By religious custom, the Moroccans frowned upon reproducing their image on film, and would hide. To overcome this, Carl devised a mirror on the camera to enable him to look backwards, quieting any suspicions the populace had that they were being photographed. Furthermore, it caused many to follow his backward gaze, thereby looking directly into the camera, producing some outstanding footage. Trek in Africa During 1924, Carl was approached by a group of four businessmen from Detroit and invited to participate in an African trek from Cairo to Cape Town completely on foot, a distance of slightly over 7,000 miles, ultimately taking 11 months to complete. This was the longest trek in the history of exploration. The group, which consisted of a doctor, realtor, lawyer, and the inventor of the Packard 12-cylinder automobile, felt the need of a professional explorer, hence Carl's participation. The purpose of the trip was the sheer accomplishment of the act for all except Carl who wanted the films that such a trip could generate. The group sailed from New York to England shortly before Christmas in 1924. Upon arrival in England, they separated with three of the group going to Paris. Carl and the doctor remained behind to secure medical information relative to protection from tropical diseases. They experienced much difficulty in reaching the doctor having the needed information, and had abandoned hope of making contact, when a last-minute call before leaving for the airport found him in his office. A forgotten Christmas gift had caused the doctor to return to his Office at the moment of their last telephone attempt. This contact caused them to cancel their air passage. The flight they cancelled caught fire in air and crashed en route with the loss of all aboard. This minor change in plans was unknown to the remainder of the group in Paris, who believing them lost, were cancelling plans to complete the expedition. Their arrival was quite a shock to the others the next morning. The trek followed a relatively direct course with large numbers of porters engaged to move the supplies south. The