NOTES ON A SALT-MARSH AT BRANSTON. 55 
Chlorine. Total Solids. 
Parts per 100,000. 
Pond No. 2, 1st Sample ue ene 2Otqae Fe we 1340 
= 2, 2nd Sample .. ie, 207. ive Se LOS.7 
x I Ser hee ie wile LG aoe ttets 
Ditch No. 2 nehoGK) Tenors S4ny. 
A second sample was taken from the marshy Ditch No. III at the 
spot marked + on the map, for the purpose of making a complete 
analysis, but during the time that elapsed between the taking of 
this sample and the former one, a considerable amount of rain 
had fallen, and hence the chlorides and solid matter are both lower 
than at first. The analysis serves a useful purpose, though, in 
showing the composition of the saline constituents. 
Parts per 
100,000. 
Specific Gravity, 1002°96. 
Free Ammonia .. ws se te me is nie As ‘Oll 
Albuminoid Ammonia .. ae x0 as s ae “058 
Chlorine... + ae AG ae Ar ée - .. 14°97 
BO CAAT Aa ilu) Shao ode” skp Reo eer eRe 
CO; o.. mn ara Se : ‘ : : ts 28 7°41 
UBC) w ee emia AUER aD Tycka) Wena Miasyal ARis, Sy Ae ae 1°38 
eR Oseanda Al Ol sd soled ics hae cise mele O'1s5 
Caio” ." : = a af Ens - ae a re. 4235 
MiaVO Ho as - fe a ta ote : ae ays 6°75 
Na, 74°76 | 
ERI Sg 89°79 
Nitregen .. ae a : S P ae age 46 0°08 
345°99 
Total Solids re cer, SRR OD att. oct mate Shy 1O 
These are probably combined as follows :— 
modic Chloride: .:.) .. ra) aboai may kath Satan toloous 
Sodic Sulphate .. re a ayn Sr oe Sc eon 4042 
Bmicesulphate sy) 2R0N) OP ee ued.) | 3 o285 
Maemesic sulphate... <5, sie am foise ajo) awe wi 4°83 
Magnesic Carbonate SA) ae as Si uw Clo ope a 6-205 
Silica, Iron, 1&e;, se) ws ” mate ad ae #86 Zhe 1°61 
345°99 
The geological explanation of the occurrence of these salt 
springs at Branston is a very simple one, for underlying the surface 
layer of alluvial gravel is the outcrop of a series of strata of red 
marl belonging to the new Red Measures. This marl was 
