The cultivation of gardens gives the full rhythm and measure of the seasonal sequence in the year. The chart of native time-reckoning (Fig. 3) brings out clearly the dependence of the gardening cycle on the seasons, and of the various phases of tribal life on gardening. To the natives the annual revolution of the seasons is defined by the cycle of agricultural activities. Even the name for 'year' is taytu, a small species of yam, which is the staple crop of the district.