Honey Dew On Leaves

The peculiar deposit often noticed on the upper surfaces of leaves, espeoially upon those of the basswood and the hickory, has been accounted for in two ways: By the excretion of a species of minute insect called aphides, and also as an exudation of the leaves themselves. It may be truthfully said that the cause of this exudation, which is a saccharine liquid of wonderful sweotness, is still an unsolved botar.ical mystery. Gray says: "It soems to be caueóü by something peculiar in the atmesjmere, and occurs most freaently on trees growing upon islands in jooperate UJ tudes."