xx Proceedings of Royal Society of Edinburgh. 
in Scotland, the divisions between the upper and lower proprietors, 
and the limits of the various estuaries, and also to frame bye-laws 
for the regulation of the fisheries. Much of this work was not only 
difficult, but involved no small amount of fatigue, and even hard- 
ship, the greater part of it having to be executed in winter, and in 
great haste, and often in very inaccessible districts, and without the 
assistance of reliable maps. Mr Leslie’s sound knowledge on all 
engineering matters, and his acknowledged integrity, led to his 
being frequently employed as an arbitrator in important cases of 
dispute, both in Scotland and elsewhere. 
About the time of the “ Railway Mania ” Mr Leslie was a good 
deal engaged in this line of business, and although he was engineer 
for several projected schemes, he never followed it up, but preferred 
to remain associated with water and harbour works. 
Mr Leslie was a man of very vigorous constitution, and until he 
had the misfortune to break his leg by a carriage accident, which 
occurred about ten years before his death, he was capable of endur- 
ing great fatigue. He continued engineer to the Edinburgh Water 
Trust until his death, he having in 1870 associated with himself in 
partnership his son, Alexander Leslie, and shortly afterwards his 
son-in-law, Mr R. C. Reid. 
Mr Leslie was connected with the Institution of Civil Engineers, 
London, for more than half a century, having been admitted as a 
member in 1833. He was elected a fellow of this Society in 1858, 
and he also belonged to various other learned societies in Edin- 
burgh and elsewhere, including the Meteorological Society of Scot- 
land, in which he continued to the last to take a deep interest. 
A man of generous disposition, Mr Leslie was a liberal subscriber 
to every public purpose that approved itself to him, and he gave 
largely to charitable institutions and also to private wants. 
In spite of his serious accident, he continued daily to take 
exercise, though with much difficulty. He was, however, entirely 
confined to bed for the last six months of his life, and endured no 
small amount of suffering, which he bore with patience and even 
cheerfulness. He died on the 29th of December 1889, in the 89th 
year of his age. 
