National Geographic : 1932 Aug
Photographs by Georg Gr. Paskoff DRYING MOUNDS OF LIGHT COCOONS A NESTING PLACE FOR BULGARIAN SILKWORMS The worms hatched from an ounce of eggs consume a ton of mulberry leaves before spinning their cocoons, anoperation which requires three orfour days. If the chrysalis were not killed by steam, a moth would eat its way through the cocoon a week later. Cocoons aredried inlight, airy ware houses before being shipped abroad. Bulgaria exports nearly a third of its silk in the form of cocoons.