198 Proceedings of the Asiatic Society. [Sept. 



3. From Lieut -Col. J. E. T. Nicholls, Officiating Secretary to the 

 Government of India, Public Works Department. Further communi- 

 cations on the Earthquakes of the 23rd May last. 



4. From Baboo Gopinath Sen " Abstract of the Hourly Meteoro- 

 logical Observations for April and May, 1866." 



5. From D. Waldie, Esq., experimental investigations connected 

 with the water supply to Calcutta. 



6. Contributions to Indian Malacology ; No. VII. A list of species 

 of Unio and Anadonta described as occurring in India, Ceylon and 

 Burma. By William T. Blanford, Esq. A. R. S. M. 



Mr. Waldie read some extracts from his paper on experimental in- 

 vestigations connected with the water supply of Calcutta, of which the 

 following is an abstract. 



Mr. Waldie commenced with some introductory remarks on the 

 attention given of late years by civilized communities to subjects bear- 

 ing on the preservation of health, and among these to the wholesome- 

 ness and purity of the water required for domestic use ; also of the spe- 

 cial interest taken in this subject at the present time by the inhabi- 

 tants of Calcutta, in connection with the supply of water for the town; 

 observing that though he himself had engaged a considerable time 

 ago in an analysis of the water of the Hooghly, it was not at all in 

 connection with this subject, but only as a contribution to general 

 science ; but that some of the results obtained had induced him, on 

 account of their local interest, to bring them under the notice of the 

 Society. He then referred to Dr. Macnamara's report on the Hooghly 

 water to the Municipality, stating that, in general, his own results went 

 to confirm those of the Report : in some particulars, not of small impor : 

 tance, they differed ; and that in others he probably had added to the 

 stock of information on the subject. 



After glancing at the influence of the seasons on the river, the 

 author referred briefly to the variations of the mineral constituents of 

 the water at the different seasons, and the influence of the tides 

 during the hot season. His own observations had been chiefly made 

 on water from the river about two or three miles above the entrance of 

 the Circular canal at the north of the town. They agreed generally with 

 those of the Report referred to. For particulars and observations he 

 referred his hearers to the paper, which would be published in extenso 



