Harry R. Caldwell was a Methodist missionary to southern China. In Blue Tiger, first published in 1924, he writes about several of his adventures in that country. An avid hunter and amateur naturalist, he notes the challenges of hunting big-game like serow, big-horn, wapiti, boar, and tiger. He describes how his hunting of man-killing tigers paved the way for effective mission work, and spends several chapters discussing the political landmines of trying to affect peace between soldiers and bandits in an effort to spare the villagers caught between their fighting. Of particular interest, Caldwell offers the description of a fascinating creature, a blue-morph tiger, that he attempted to capture for science. Only a few blue tigers have been reported in the archives of cryptozoology.
