x MISCELEANEOUS NOTES 267 
they use their eyes have been given. I will here 
add another which seems worth recording. On 
May 18, 1911, a Zapzdarzws queen from one of my 
artificial domiciles was seen visiting a bunch of 
bluebells that had been placed on the sill outside 
the kitchen window. A similar bunch of bluebells 
was standing on a table inside the closed window 
of my study. The queen several times came round 
to my study window and persistently beat against 
the glass in her endeavour to reach the flowers 
inside. This incident shows how humble-bees note 
the kind of situation in which their favourite plants 
grow, and how quickly they learn to search for them 
there. 
No one who has watched humble-bees gathering 
food can doubt that they know and distinguish the 
flowers by their colours rather than by the scent of 
the nectar. 
They know where all the clumps of their 
favourite flowers are situated, and may often be 
seen paying a round of visits to groups of white- 
dead-nettle and hedge-woundwort. Not only this, 
but they frequently remember the -position of each 
plant and even of each floret, for I have often 
observed them travelling from one _ half-hidden 
floret to another with the swiftness and assurance 
of familiarity. 
Under ordinary circumstances, whether she is 
in or out of the nest, a humble-bee that is in an 
animated state, that is, whose abdomen is expanding 
and contracting, always shows signs of conscious- 
