The presence of this disorder is indicated by the appearance of the excrement, which, instead of a reddish yellow, exhibits a muddy black colour, and has an intolerably offensive smell. Also by its being voided upon the floors, and at the entrance of the hives, which bees, in a healthy State, are particularly careful to preserve clean. +Huish+ compares the morbid excrement to linseed. +Vertigo.+ _Vertige_, as +Du Carne de Blangy+ calls it, is supposed to arise from the bees extracting the honey of deleterious plants. I have treated fully upon this subject under the head of Pasturage. In addition to what has been there stated I will give an extract from +Dr. Barton's+ _Paper_, who after observing that there is more poetry than philosophy in the following lines of Pope-- "In the nice bee what sense so subtly true From poisonous herbs extracts the healing dew?" says: "It is however much to be questioned whether this noxious honey proves so to the bees themselves." Sir J. E. Smith asserts that "the nectar of plants is not poisonous to bees." _Syllabus to Botan. Lect._ And Dr. Barton, though disposed to adopt the contrary opinion, gives instances to the same effect. Thus a party of young men, induced by the prospect of gain, having removed their hives from _Pennsylvania_ to _the Jerseys_, whose vast savannahs were finely painted with the flowers of the _Kalmia angustifolia_, could not use or dispose of their honey, on account of its intoxicating quality; yet, "the bees increased prodigiously," an increase only to be explained by their being well and _harmlessly_ fed. This disorder is marked, we are told, by a dizzy manner of flying, and by irregular motions, such as starting, falling down, &c. when the bees are pursuing their usual occupations. To these symptoms succeed lassitude and death. No remedy has hitherto been discovered for this malady. +Huber+ _says that vertigo attacks ants_, and causes them to lose the power of moving in a straight line, and occasions the performance of rapid gyrations always in the same direction: he observed one insect make about 1000 turns in an hour, describing a circle of about an inch in diameter; this continued for seven days: he does not say whether he ever knew any instance of a recovery.