Meaning:
“Full of devices, crotchets, fancies, inventions, and dreamy theories. The connection between bees and the soul was once generally maintained: hence Mahomet admits bees to Paradise. Porphyry says of fountains, “they are adapted to the nymphs, or those souls which the ancients called bees.” The moon was called a bee by the priestesses of Ceres, and the word lunatic or moon-struck still means one with “bees in his head.”
More at: http://www.bartleby.com/81/1590.html
From: The Dictionary of Phrase and Fable pub. 1898 by E. Cobham Brewer (1810–1897)
Bee Lore 
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