Slide showing diagram of three views of dragon fly. Slide shows diagrams of three different views of dragon fly. Labelled A, B, C. Description reads, 'Fig. 1 - B. forced position of larva of the dragon fly (aeschna) whose left cerebral ganglion is destroyed. The body is convex on the left side, due to a relaxation of the muscles connecting the segments on the left side. The position of the legs is such that the animal can only move in circles to the right. This asymmetry disappears again when both ganglia are destroyed, C. A. normal animal (after Matula)'. Late 19th - early 20th century