THE RIVER BURE AND ITS TRIBUTARIES. 229 
No difference was found between the times of high water at 
the two points. 
Another short series of readings taken above the Bridge 
on September 5th — 7th, 1905, with the moon at its first 
quarter and light Southerly winds, showed a range of 7 to 9 
inches, so that the range at Acle Bridge may be taken as 
7 — 9 inches at neaps and 13 — 15 inches at springs. 
Thurne Mouth. 
Between Acle Bridge and Thurne Mouth the distance is 
2J miles. As shown by charts taken simultaneously at Acle 
and at Thurne Mouth on July 6th — 7th (full moon), there 
was a loss of range of 5.3 inches. The range at Thurne Mouth 
was, on this occasion, 8.7 inches. On September 10th — nth, 
1905, at neap tides the range was 7 inches, so that it appears 
that the difference between springs and neaps becomes more 
than proportionately less, the smaller is the range. 
St. Benet’s Abbey. 
At Thurne Mouth the Thurne River enters the Bure and 
receives a branch of the tidal wave. Following the course of 
the Bure for two miles the South Walsham Cut enters on the 
left and the River Ant on the right. The ruins of the Abbey 
stand on the North bank nearly opposite the South Walsham 
Cut. Several charts of the tide have been taken at various 
points in this part of the Bure sufficiently near to be treated 
together. 
At this point, between St. Benet’s Abbey and the Ant 
Mouth, the range of the tide is about 5 inches. No relation 
has been traced between the range and the prevalence of 
spring or neap tides, and the variations observed are probably 
entirely due to wind and the height of the water level, since 
it appears that, roughly speaking, the higher the level the 
less the range. The range has been found to vary between 
2.3 in. and 5.7 in., but is usually about 5 in. 
On September 25th, 1906, two tide gauges were set up, 
