126 Mr. Waldie's Investigations connected [No. 2, 



With reference to this table, a few remarks may be made. The 

 rainy season waters were taken during Neap tides at ebb. Probably 

 they would not have differed much, though they had been taken at 

 spring tide during flood. Special remarks will be made on these 

 afterwards. 



The numbers attached to the waters of November and January, 

 shew that the surface water contains more organic impurity than the 

 deep, and that there is a very decided excess of this during flood tide 

 as compared with ebb. 



The May and June waters are the old ones, — open to future 

 emendation as to quantity of organic matter. But even these indicate 

 a still larger excess of organic matter during flood tide. And com- 

 paratively small though the amount of organic matter be, compared 

 with those hitherto generally received, they shew the influence of the 

 tides in bringing up organic matter, as has not been shewn before. 



I have already observed that the opposition, with which my state- 

 ments as to the small amounts of organic matter originally met with, 

 has been now in a great measure withdrawn ; yet it may be desirable 

 to make a few observations on the subject. Having regard to 

 the delay in examining the waters of the cold and hot seasons, 

 I abandoned those in which the water had stood from two to four 

 months, (the cold season samples) ; but did not think that the delay of 

 from nine to sixteen days would materially affect the correctness of 

 the results from the hot season waters. Reasons have already been 

 given in the Supplementary Observations for this, to some probably 

 not sufficiently conclusive, so I shall in the first place give the results 

 of the examination of another class of waters, which may have some 

 bearing on the subject. These are the waters of the Salt Water Lake 

 and of the Circular Canal. 



The Salt Water Lake is a large salt marsh of about one-third of the 

 degree of saltness of sea water, about two miles to the eastward of 

 the boundary of the town. From Entally, near the Circular Road, a 

 canal proceeds eastwards towards it, called the Baliaghatta Canal. At 

 this extremity it forms a cul de sac, but is joined about half way in 

 its course by another branch which proceeds from the river at the 

 northern extremity of the town, and in its course, enclosing all the 

 northern part of the town, at length joins the Entally branch. These 



