of Edinburgh, Session 1885 - 86 . 463 
stopper by a cord when tbe desired depth was reached. The pole 
or line was graduated to feet. By this means, the bottle being 
lowered full of air, water was let in from a plane that could be 
Fig. 1. — Sketch-Map of Mouth of Spey, August 1885. Light shading shows 
parts covered at high water. 
determined to 1 inch in calm weather. It was a little difficult to 
get a true bottom sample in this way ; but it was secured, when a 
