Aardige manier van koejen te melken en boter te maken (Nice way to milk cows and make butter). The Khoikhoi are the traditionally nomadic pastoralist non-Bantu indigenous population of southwestern Africa. The Khoikhoi use a technique called cow blowing (Kuhblasen, phooka, or doom dev) in which forceful blowing of air into a cow's anus (or sometimes vagina) is applied to induce her to produce more milk. Peter Kolbe (1675-1726) was a Dutch astronomer and naturalist. He is best remembered for his publication Naauwkeurige beschryving van de Kaap de Goede Hoop, describing the geography, climate, flora and fauna, followed by an accurate study of the Hottentots (Khoikhoi), covering their language, religion, lifestyle and customs. Image appeared in: Naauwkeurige beschryving van de Kaap de Goede Hoop by Peter Kolbe, 1727.