Proc. Roy. Socy. of Edin.~\ 
[Vol. XXV. 
Fig. 3. — Portion of a stem of Potamogeton natans from a lake at Lismore, showing 
incrustation of calcium carbonate. (Magnified three diameters.) 
Fig. 4. — General view of Loch Ness from Borlum, near Fort- Augustus, 
looking north-east. 
[Plate 2. — Referred to on pages 969 and 985. 
Mr George West. 
