Among the workers I saw some ants whose heads and mandibles were very large. These ants never engaged in any of the agricultural pursuits of their sisters; they were the soldiers and the sentinels of the community. One nest migrated while I had them under observation, and I had the pleasure of witnessing the behavior of these fearless little warriors when on the march. The ants were moving nearer to their grain-fields, and were carrying with them their young, etc. The route, from the old home to the new, was patrolled on either side by soldiers. Every now and then I saw one of these individuals rush aside, elevate herself on her hind legs, shake her head, and clash her mandibles. She acted as if she saw some danger menacing the marching column and would ward it off. Others climbed little twigs or tufts of grass and scanned the surrounding country from these elevated and commanding positions. Others hurried up the laggards and stragglers, and even carried the weak and infirm. These ants winnow or husk the grain after it has been carried into the nest. All during the harvesting I observed workers bringing chaff from the nest and carrying it some distance away. It is said by Texan observers that the harvesters of that state bring the grain to the surface and dry it, if, perchance, it becomes wet. I have never observed this myself, but accept it as an established fact.[84] [84] I believe that these observations on the presence of the harvester ant in Arkansas are unique; at least I have been unable to find any data corroborative of this fact. How did a fecundated queen arrive at a spot so far from her usual habitat?--W. The faculty of computing is among the very last of the psychical habitudes acquired by man, and is an evidence of high ratiocinative ability. Many of the savage races are unable to count above three,--some not above five,--thus demonstrating the truthfulness of the above assertion. Yet I believe that it can be clearly shown that some of the lower animals and many of the higher animals are able to count.