The existence of such communities as those of ants or bees implies, no doubt, some power of communication, but the amount is still a matter of doubt. It is well known that if one bee or ant discovers a store of food, others soon find their way to it. This, however, does not prove much. It makes all the difference whether they are brought or sent. If they merely accompany on her return a companion who has brought a store of food, it does not imply much. To test this, therefore, I made several experiments. For instance, one cold day my ants were almost all in their nests. One only was out hunting and about six feet from home. I took a dead bluebottle fly, pinned it on to a piece of cork, and put it down just in front of her. She at once tried to carry off the fly, but to her surprise found it immovable. She tugged and tugged, first one way and then another for about twenty minutes, and then went straight off to the nest. During that time not a single ant had come out; in fact she was the only ant of that nest out at the time. She went straight in, but in a few seconds--less than half a minute--came out again with no less than twelve friends, who trooped off with her, and eventually tore up the dead fly, carrying it off in triumph. Now the first ant took nothing home with her; she must therefore somehow have made her friends understand that she had found some food, and wanted them to come and help her to secure it. In all such cases, however, so far as my experience goes, the ants brought their friends, and some of my experiments indicated that they are unable to send them. Certain species of ants, again, make slaves of others, as Huber first observed. If a colony of the slave-making ants is changing the nest, a matter which is left to the discretion of the slaves, the latter carry their mistresses to their new home. Again, if I uncovered one of my nests of the Fuscous ant (Formica fusca), they all began running about in search of some place of refuge. If now I covered over one small part of the nest, after a while some ant discovered it. In such a case, however, the brave little insect never remained there, she came out in search of her friends, and the first one she met she took up in her jaws, threw over her shoulder (their way of carrying friends), and took into the covered part; then both came out again, found two more friends and brought them in, the same manoeuvre being repeated until the whole community was in a place of safety. This I think says much for their public spirit, but it seems to prove that, in F. fusca at least, the powers of communication are but limited. One kind of slave-making ant has become so completely dependent on their slaves that even if provided with food they will die of hunger, unless there is a slave to put it into their mouths, I found, however, that they would thrive very well if supplied with a slave for an hour or so once a week to clean and feed them.