The dirt roads in much of Kanchanaburi Province were unsuitable for hauling freight, so we of the Thai National Malaria Education Project often had to transport our supplies by boat. The boats were flat-bottomed craft with automobile engines mounted on long propeller shafts, which gave them quite a turn of speed. On this particular expedition, we were hauling powdered DDT, spray cans, mixing buckets, spray team members, personal belongings, chili sauce and rice up the River Kwai to the Pass of the Three Pagodas. We subsisted on the aforementioned chili sauce and rice, bamboo shoots cut from the surrounding jungle and chickens purchased from villagers 3 meals a day for 4 weeks at a time. My Thai boss recommended that I wear Thai civil service uniform, so the villagers would know who I was and what I was there for. They might otherwise have mistaken me for a "hipi" looking for opium.