Note 23 — 5. Permanence of Lakes.

This was the lowest level recorded at the time when I drew the static contours on the map. The further exploration of the depression by Mr. Walpole in the present year has shown that at one place the ground-level descends to − 134 metres; the situation of this local deepening is, however, such that the drawing of the static contours would not have been affected by its inclusion in the list of adopted data.