626 Proceedings of Royal Society of Edinburgh. [sess. 
During the period of gauging, three of the gauges were tampered 
with — No, 3 in May 1896, No. 7 in April 1899, No. 2 in June 
1899 — and in these cases the average of the remaining gauges 
for the month was assumed. 
No. 2 gauge was frozen in January and March 1897, in February 
1898, in January 1899, and in January, February, and March 
1900. No. 3 was frozen in January 1897, in February 1898, 
in January 1899, and in January, February, and March 1900; 
No. 4 in January 1900. In dividing the total amounts collected in 
these gauges during the frozen period, the average of the remaining 
gauges during each month was taken, and the total amount frozen 
was divided proportionally. 
At the outset, it was arranged that the various gauges should be 
so placed that their readings should give a proper representation of 
the rainfall over the drainage area to the Talla Reservoir. The 
daily gauges Nos. 5, 6, and 7 were so placed that they might 
be very easily and regularly reached by persons living or engaged 
in the neighbourhood. For instance, the Tweedsmuir school- 
master attended to No. 7, and the farmers or shepherds attended 
to Nos. 5 and 6, which were placed close to the farmhouses of 
Gameshope and Talla Linns. The daily and monthly readings 
were used to check one another. 
The whole of the monthly gauges were regularly visited and 
read on the first day of each month by two assistant engineers 
who represented the two arbiters. The authors have much 
pleasure in recording their high appreciation of the faithful 
manner in which their assistants performed their duty, notwith- 
standing the particularly inclement weather conditions on many 
occasions. The reading of the monthly gauges involved a pretty 
hard day’s work even in ordinary weather. The section accom- 
panying the paper gives an indication of the ground that had to be 
traversed and the hills that had to be ascended by the observers 
between the times that they left their carriage on the road and 
returned to it again. It will readily be understood that in foggy 
weather it was a matter of no small difficulty to find some of the 
outlying gauges, especially at places where there were neither 
fences nor running water. On the other hand, on account of deep 
snow and drifts, the observers’ work at times was still harder. It 
