154 



Silt held in suspension by the Hooghly. 



[No. 2. 



Table II. 

 Tabular statement of the amount of silt held in suspension at a mean 

 depth of 3 fathoms by the water of the Hooghly, at Calcutta, for 

 each month, April, 1854 to March, 1855. 



No. 



Date. 



Quantity of 

 water. 



Solid earthy 



matters 



(silt). 



8.9 



Total of solid 

 matters, silt 

 and lime. 



Lime in the 

 solid mat- 

 ter only. 



1 

 2 

 3 



4 

 5 

 6 



7 

 8 

 9 



10 

 11 



12 



1854 



3rd April, 



4th May, 



5th June, 



4th July, 



7th August, .... 

 1st September, . . 

 1st October, .... 

 4th November, . . 

 1st December, .. 



1855. 

 2nd January, .... 

 3rd February, . . 

 8th March, 



Oz. 



22.60 

 23.80 

 21.20 

 22.50 

 23.50 

 24.50 

 26.00 

 26.00 

 22.50 



24.00 

 23.80 

 24.00 



grs. 

 8.70 

 625 

 1.30 

 6.50 



13.30 

 7.62 

 7.00 

 2.60 

 1.60 



2.36 

 8 50 

 6.50 



grs. 

 1.60 

 1.00 

 3.12 

 1.00 

 0.08 

 1.10 

 0.72 

 0.89 

 0.75 



2.60 

 1.18 

 1.76 



grs. 



10.30 

 7.25 

 4.42 



7.50 

 13.38 



8.72 



7-72 



3.49 

 2.35 



4.96 

 9.68 

 8.26 



grs. 

 0.15 



Trace. 

 0.00 

 0.00 



Trace. 



Trace. 

 0.00 

 0.00 

 0.00 



0.00 

 1.00 

 00 





Totals,.. 

 Means, . . 



284.40 



72.23 



15.80 



88.03 



1.15 





23.70 



6.02 



1.32* 



7.34 



0.09 



Before giving the results of the examination of the waters at the 

 Gasper Floating Light Vessel it may be as well to remark on the 

 results now obtained in comparison with those shewn in my first 

 paper. To save the trouble of reference I set down here the mean 

 results of each column from both examinations. 



Per month. 



Surface 

 water, 



in 1842. 



oz. 



Mean Quantity of Water, 25. | 



Solid earthy matter, silt,.. 6 04: 

 Carbonate of Lime in water, 7.95 

 Total of solid matter, i. e. 



Silt and Lime, 13.99 



Surface 



water, 



in 1854-55. 



oz. 



24.14 



3.30 



1.47 



4.77 



Water at 3 



fs. depth in 



1854-55. 



oz. 



23.70 



6.02 



1.32 



7.34 



Less magnesia 0.312 per month. 



