Letter to Sir Archibald Geikie from James Bennie sending some specimens of shells from the bottom of a Gayfield Lake. Bennie reports that there was considerable vegetable debris also found at the lake bottom which was probably pondweed and encrustations from the stems of the plants. Numerous ostracod were also found which he has mounted on cards and sent to another party. This layer was 3-4 feet deep. The same layer was not found in the adjacent Broughton Lake.