This volume reproduces a nineteenth-century manuscript on astrology that belonged to a Mongolian petty official whom many Mongols consulted on such questions as the outcome of illnesses, and auspicious days for marriage, burying the deceased, and lodging complaints on legal matters. The manuscript contains sixty-one leaves. In his introduction, in French, the eminent Belgian scholar Antoine Mostaert describes the content of the manuscript, noting matters of special interest and translating large portions.