Riem, a German Apiarian, first discovered that workers sometimes lay eggs. Huber, in the course of his investigations on this subject, ascertained that such workers were raised in hives that had lost their queen, and in the vicinity of the royal cells in which young queens were being reared. He conjectured that they received accidentally, a small portion of the peculiar food of these infant queens, and in this way, he accounted for their reproductive organs being more developed than those of other workers. Workers reared in such hives, are in close proximity to the young queens, and there is certainly much probability that some of the royal jelly may be accidentally dropped into their cells; as, in these hives, the queen cells when first commenced are parallel to the horizon, instead of being perpendicular to it, as they are in other hives. I do not feel confident, however, that they are not sometimes bred in hives which have not lost their queen. The kind of eggs laid by these fertile workers, has already been noticed. Such workers are seldom tolerated in hives containing a fertile, healthy queen, though instances of this kind have been known to occur. The worker is much smaller than either the queen or the drone.[5] It is furnished with a tongue or proboscis, of the most curious and complicated structure, which, when not in use, is nicely folded under its abdomen; with this, it licks or brushes up the honey, which is thence conveyed to its honey-bag. This receptacle is not larger than a very small pea, and is so perfectly transparent, as to appear when filled, of the same color with its contents; it is properly the first stomach of the bee, and is surrounded by muscles which enable the bee to compress it, and empty its contents through her proboscis into the cells. (See Chapter on Honey.) The hinder legs of the worker are furnished with a spoon-shaped hollow or basket, to receive the pollen or bee bread which she gathers from the flowers. (See Chapter on Pollen.)