[AD] Philosophical Trans. for 1792, p. 143.
[AE] Huber on Bees.
[AF] American Quarterly Review for June, 1828, p. 382.
[AG] Latreille, Mém. Acad. des Sciences, 1821.
[AH] Huber on Bees, p. 325.
[AI] From two Greek words [Greek: pro polis] meaning _before the city_, as the substance is principally applied to the projecting parts of the hive.
[AJ] Phil. Trans. for 1807, p. 242.
[AK] Schirach, Hist. des Abeilles, p. 241.
[AL] Kirby and Spence observed bees very busy in collecting propolis from the tacamahaca-tree (_Populus balsamifera_).—Introd., ii. 186.
[AM] Huber on Bees, p. 408.