Three large Photographs showing Batwa men, inhabiting the Bangveolo Marshes, Rhodesia, engaged in drilling fire; one man alone operates, squatting on a mat of bark-cloth outside a hut of reeds and holding hearth in position with his feet; others, also squatting, look on; photos taken by Count Eric von Rosen, of Rockelstad Castle, Sparreholm, Sweden, during his Expedition through Africa in 1911 (see his "Från Kap til "Alexandria", 1913), and presented by him in 1927.