702 



DR HUGH ROBERT MILL ON THE 



Table XXXI. — Percentage of Sea Water, and Amount of Salts present at the Periods of observed 

 Maximum (August 1886) and Minimum (February 1887). 



Basin. 



August 1886. 



February 1887. 





Vol. Sea 



Vol. River 





Vol. Sea 



Vol. River 





Per cent. 



Water. 



Water. 



Per cent. 



Water. 



Water. 





Sea Water. 



Cubic 



Cubic 



Sea Water. 



Cubic 



Cubic 







Sea Miles. 



Sea Miles. 





Sea Miles. 



Sea Miles. 



Gareloch, .... 



91-4 



00219 



0-0021 



84-6 



0-0203 



0-0037 



Loch Goil, 



94-8 



00353 



0-0019 



86-7 



0-0324 



0-0048 



Loch Long, 



94-7 



0-0309 



0-0017 



87-1 



0-0284 



0-0042 



Loch Strivan, 



96-6 



0-1564 



0-0055 



86-4 



0-1400 



0-0219 



Holy Loch, 



95-2 



o-oioi 



0-0006 



88-7 



0-0095 



0-0012 



Dunoon Basin, . 



95-4 



0-7046 



0-0332 



86-1 



0-6353 



0-1025 



Loch Ridun and Kyles, 



95-7 



00927 



0-0044 



91-3 



0-0885 



0-0086 



Loch Fyne, 



95-1 



0-4737 



0-0244 



88-8 



0-4422 



0-0559 



Arran Basin, 



96-9 



17-4776 



0-5596 



94-7 



17-0811 



0-9561 



Plateau, .... 



97-9 



5-6880 



0-1117 



95-4 



5-5330 



0-2667 



Channel, .... 



98-5 



• • • 



• < • 



96-7 







Estuary (estimate), 



55-0 



0-0572 



0-0517 



40-0 



0-0435 



0-0654 



Total, excluding Channel, . 



96-8 



24-7484 



0-7968 



94-2 



24-0542 



1-4910 



Total, Landward Division, . 



92-5 



1-5828 



0-1255 



84-3 



1-4401 



0-2682 



Total, Seaward Division, 



97-2 



23T656 



0-6713 



94-8 



22-6141 



1-2228 



Total, Landward, excluding 















Estuary, 



95-3 



1-5256 



0-0738 



87-4 



1-3966 



0-2028 



In August 1886 the entire Sea Area contained 96*8 per cent, of sea water, in February 

 1887 it contained only 94*2 per cent. In the former month there was present 0*7968, and 

 in the latter 1'4910 cubic miles of fresh water, or almost double the amount. Between 

 August and February 0*6942 of a cubic sea mile must have been received in excess of 

 what was removed by evaporation and tidal action. The fresh water sent in by the 

 Clyde drainage area for the six months, August 1886-January 1887, was 0*9294 cubic 

 sea miles (Table TX.), supposing that one half of the annual evaporation had taken place 

 in that period, the total rainfall thus amounting practically to 1*43 cubic sea miles. 

 Mr Symons' researches (British Rainfall, 1889) show that only 30 per cent, of the annual 

 evaporation takes place in the six months, August-January. This would withdraw 0*30 

 cubic mile from the Sea Area, leaving the nett increase of fresh water by rainfall as 1*13 

 cubic miles. But the average action of the tides would account for the withdrawal of 

 0*823 cubic miles in that period, leaving an accumulation of only 0*307 cubic miles to 

 freshen the water, which is considerably less than half the amount actually found. If 

 instead of 30 per cent, of the annual evaporation taken place in the six months under dis- 



