PREFACE 
This publication consists of six volumes, two of text and 
four of maps, and gives an account of the work done, of 
the observations recorded, and of most of the results 
obtained, during an investigation into the bathymetry of 
the fresh- water lochs or lakes of Scotland between the 
years 1897 and 1909. 
Although the determination of the depths of the lakes, 
and of the general form of the basins in which they lie, 
made up the principal work of the Survey, still a very large 
number of observations were carried out in other branches 
of the science of limnography. Many of these observations 
and the results were published from time to time, as 
the work proceeded, in scientific journals, while others 
now appear in print for the first time. 
Volume I. consists for the most part of new matter. 
It includes numerous articles dealing with the general 
results of the researches from the topographical, geological, 
physical, chemical, and biological points of view, a com- 
parison of Scottish lakes with lakes in other parts of the 
world, and various theoretical considerations. These 
articles have been written chiefly by gentlemen who have 
taken an active part in the field-work of the Survey. 
This volume also contains an extensive bibliography of 
books and special papers referring to lakes. 
Volume II. contains the special descriptions of the lakes, 
the maps of which appear in Volumes III., IV., V., and VI. 
Throughout the text will be found numerous index-maps, 
showing the drainage areas of the districts in which the 
lochs are situated, together with other illustrations. 
The bathymetrical maps have all appeared during the 
past eight years in the Journal of the Royal Geographical 
Society or in an extra publication of the same Society ; 
and some of the maps have also been published in the 
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