VIOLET FAMILY 139 
tage to the flower, which can sift the pollen down- 
ward on the bee instead of exposing it to pollen- 
eating interlopers. Among the latter may be 
classed the bumble-bees and butterflies, whose 
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Photograph by A.H.Verrill 
BLUE VIOLET 
long tongues pilfer ad libitum. ‘For the proper 
visitors to the bearded Violets,’ says Mr. Robert- 
son, ‘we must look to the small bees, among 
which the Osmias are the most important.’ ”’ 
