The same thing is well shown by another form of experiment. 'Some food was placed at the point _a_ (Figs. 3 and 4) on a board measuring 20 inches by 12 inches, and so arranged that the ants in going straight from it to the nest would reach the board at the point _b_, and after passing under the paper tunnel _c_, would proceed between five pairs of wooden bricks, each 3 inches in length and 1-3/4 inches in height. When they got to know their way they went quite straight along the line _d e_ to _a_. The board was then twisted as shown in Fig. 4. 'The bricks and tunnel being arranged exactly in the same direction as before, but the board having been moved, the line _d e_ was now outside them. The change, however, did not at all discompose the ants; but instead of going, as before, through the tunnel and between the rows of bricks to _a_, they walked exactly along the old path to _e_.' Keeping the board steady, but moving the brick pathway to the left-hand corner of the board where the food was next placed (Fig. 5), had the effect of making the ant first go to the old position of the food at _a_, whence it veered to a new position, which we may call _x_. The bricks and food were then moved towards the right-hand corner of the board--_i.e._ over a distance of 8 inches (Fig. 6). The ant now first went to _a_, then to _x_, and not finding the food at either place, set to work to look for it at random, and was only successful after twenty-five minutes' wandering. [Illustration: Fig. 6.] And, as evidence how much more dependence they place upon scent in finding their way than upon any other of their faculties, it is desirable to quote yet one further experiment, which is of great interest as showing that when their sense of smell is made to contradict their sense of direction, they follow the former, notwithstanding, as we shall presently see, the wonderful accuracy of the information which is supplied to them by the latter. 'If, when _F. niger_ were carrying off larvæ placed in a cup on a piece of board, I turned the board round so that the side which had been turned towards the nest was away from it, and _vice versâ_, the ants always returned over the same track on the board, and, in consequence, directly away from home. If I moved my board to the other side of my artificial nest, the result was the same. Evidently they followed the road, not the direction.' There can be little doubt that ants have a sense of taste, as they are so well able to distinguish sugary substances; and it is unquestionable that in their antennæ they possess highly elaborated organs of touch. _Sense of Direction._