Another species of _Pemphigus_ gives rise to certain solitary plum-like galls, which appear on the upper surface of the red elm. These galls are hollow, with a thin skin, and within the hollows are the lice, which secrete an abundant sweet that often attracts the bees to a feast of fat things, as the gall is torn apart, or cracks open, so that the sweet exudes. This sweet is anything but disagreeable, and may not be unwholesome to the bees. Another aphis, of a black hue, works on the branches of our willows, which they often entirely cover, and thus greatly damage another tree valuable for both honey and pollen. Were it not that they seldom are so numerous two years in succession, they would certainly banish from among us one of our most ornamental and valuable honey-producing trees. These are fairly thronged in September and October, and not unfrequently in spring and summer if the lice are abundant, by bees, wasps, ants, and various two-winged flies, all eager to lap, up the oozing sweets. This louse is doubtless the _Lachnus dentatus_, of Le Baron, and the _Aphis salicti_, of Harris. Bees also get, in some regions, a sort of honey-dew, which enables them to add to their stores with surprising rapidity. I remember one morning while riding on horse-back along the Sacramento river, in California, I broke off a willow twig beside the road when, to my surprise, I found it was fairly decked with drops of honey. Upon further examination I found the willow foliage was abundantly sprinkled by these delicious drops. These shrubs were undisturbed by insects, nor were they under trees. Here then was a real case of honey-dew, which must have been distilled through the night by the leaves. I never saw any such phenomenon in Michigan, yet others have. Dr. A. H. Atkins, an accurate and conscientious observer, has noted this honey-dew more than once here in Central Michigan.