THE BURE AND ITS TRIBUTARIES. 
245 
Matter borrowed from the above-mentioned sources has 
been duly acknowledged, either in the text, or in foot-notes. 
Where no such acknowledgment appears, the results have 
been taken from the author’s own work at the Sutton Broad 
Laboratory. 
The Salinity is caused by common salt (Sodium Chloride) 
and, to a lesser extent, by Magnesium Chloride and by Calcium 
Chloride. The best and most usual method of expressing 
salinity is to state the total amount of Chlorine present in the 
form of the above chlorides without regard to the question 
as to the proportion in which it is shared among the three 
bases, Soda, Magnesia, and Lime. Adopting this plan, and 
making use of British units, all the salinities in the following 
pages have been expressed in grains of Chlorine (as Chlorides) 
per gallon of water — (i gallon=70,ooo grains). 
The Hardness, whether Temporary or Permanent, has been 
expressed in English degrees, i.e., as grains of Calcium Car- 
bonate per gallon. All other substances which can contribute 
to the hardness have, for purposes of calculation, been 
expressed as Calcium Carbonate. 
The subject divides itself naturally into sections as 
follows : — 
The Bure below Thurne Mouth . . Section II. 
The Thurne River .... Section III. 
The Bure above Thurne Mouth . . Section IV. 
The Ant . . . . . . - Section V. 
To these has been added a section on 
Abnormal Tides .... Section VI. 
SECTION II. 
The Bure below Thurne Mouth. 
In Table I. several series of analyses of waters from this 
section of the river are reproduced. Table II. contains an 
investigation of the whole stretch from Thurne Mouth to 
Yarmouth. Of the two parts of this table, the first deals 
with the river as far down as Acle Bridge, the second with 
the stretch from Acle to Yarmouth. 
