Langstroth on the Hive and the Honey-Bee: A Bee Keeper's Manual
Chapter 4
PROPOLIS OR BEE GLUE. Whence it is obtained. Huber's experiment, 85. Its use. Comb varnished with it. The moth deposits her eggs in it, 85. Propolis difficult for bees to work. Curious use of it by bees, 87. Ingenuity of bees admirable, 88.