Whether or not bees appreciate sound, is another moot point. It is, indeed, doubted by many observers whether hearing is possessed at all by insects. Sir John Lubbock records a series of experiments which he conducted on this point, to which we shall make reference a little later on. Those writers, who credit bees with the ability to distinguish sound waves, incline to the belief that the power resides in the antennas. As modern science has shown that all our physical impressions are modifications of vibration, variously interpreted, according to the means by which they are conveyed to the sensorium, we may readily imagine that more than one faculty may reside in these jointed organs of which we have been speaking, and that each separate part may possibly have its own specific function; while, by combined action, such differences may be made as are analogous to chords, and harmonies, or discords in music, as compared with the striking of single notes. We have dwelt at considerable length on the subject of the antennæ, not simply because what is known of them is so remarkable, but because we wish to draw attention to the fact that there is here a most interesting field for further investigation. Much remains to be done to clear up the mysteries still unsolved, and to harmonise the various observations already made respecting the nature and properties of these organs, which, not only in bees, but in many other families of insects, play such an important part in their life-history. _The Mouth._--Passing next to the mouth, we find a somewhat complex structure; for it consists of many parts, each of which has its ascertained function. We find first, the _labrum_, or upper lip; the _epipharynx_, or valve closing the aperture of the gullet; the _pharynx_, or gullet, forming the true mouth, as well as the entrance to the _œsophagus_, or food-pipe; the _hypopharynx_, lying just below the gullet; the _labium_, or lower lip; and the _proboscis_, or true tongue. These are all single parts; but there are also pairs of _mandibles_, or upper jaws, and _maxillæ_, or lower jaws, besides _palpi_--certain jointed, sensiferous organs, whose functions are not well understood, but which are possibly connected with the sensation of taste. The _labrum_, or upper lip, has a vertical motion, and when not in use falls over the organs beneath it; while it is covered, in its turn, by the _mandibles_, which are jointed on to the cheeks, and act laterally. The _pharynx_ is a cavity lying beneath the _epipharynx_, and can be closed by the latter, over which the two previously described parts lap, so that the entrance to the œsophagus is trebly protected. The _labium_, or lower lip, is capable of being pushed forward and retracted, and lies, when not in use, within the under cavity of the head. On either side are the _maxillæ_, or so-called jaws, which form the under sheath of the rest of the lingual structures when in repose.