That the antennæ should have been regarded as organs of smell is not surprising when the proceedings of the bees on visiting flowers are considered; their first act is to introduce one of the antennæ, but no further than the tip: this conduct would naturally enough convey the idea of looking or smelling for nectar; yet it does not at all militate against the opinion that the antennæ are transmitters of sound; the sense which they supply may, in these little creatures, be so very fine, as to enable them to hear the bursting of an anther, or the exudation of nectar. The continual motion of the antennæ of insects from side to side, when they walk, conveys the idea that it is by their means that they inform themselves of what is going on in their immediate vicinity. The importance of the antennæ may be inferred from their very complicated structure. +Mr. Kirby+ has observed, that in one species of _Apis_ which he examined, under a powerful magnifier, the ten last joints of the antennæ appeared to be composed of innumerable hexagons, and from this similarity in their structure to the eyes (_Vide_ Senses of Bees) he thought that they might serve a somewhat analogous purpose. What I have said with respect to the Senses of Bees, in another place, will I think make it evident that these insects possess an organ of smell, but with respect to its situation naturalists differ. +Baster+, +Lehmann+, and +Cuvier+, consider the spiracles as the organs of smell, as well as of respiration: this opinion is founded upon the notion that, without the inspiration of air, there can be no smell; and that as insects are smaller than the food they live upon, it would be of no consequence to them where this sense was situated. +Kirby+ and +Spence+, on the contrary, suppose that it resides in some organ near the mouth: in other parts of the animal creation certainly, that is its situation; and as there seems to be a necessary connection between smell and taste, analogy should lead us to argue in favour of that opinion; but though smell be usually accompanied by respiratory organs, they may not be essentially necessary to it; a bee may receive impressions from external objects, in a manner which we cannot comprehend. In confirmation of this opinion of +Kirby+ and +Spence+, we have the experiments of +Huber+. It seems that no odour is so unpleasant to insects as that of oil of turpentine. +M. Huber+ having presented this oil, on the point of a camel's hair pencil, successively to every part of the abdomen, trunk and head, it excited no uneasiness in the bee: he then tried the eyes and antennæ, but with the same result; yet as soon as he pointed it a little above the insertion of the proboscis, near the cavity of the mouth, the bee receded, became agitated, clapped its wings, and would have taken flight, had not the pencil been withdrawn. This experiment was repeated with the turpentine and other articles of penetrating odour, and with