Mr. Hassall found that the weight of pollen produced by a single plant of the Bulrush (Typha) was 144 grains.

It is only after a careful examination, that we recognise each of these plants for distinct species,* (* Potamogeton tenuifolium, Chara compressa, Typha tenuifolia.)

We find there, pondweed (potamogeton), chara, and cats'-tail three feet high, which it is difficult not to confound with the Typha angustifolia of our marshes.

Rubbish started to accumulate in the water storage basins, which were invaded by "typha" grass growing several meters high.