140 



Mr. Waldie's Investigations connected 



[No. 2, 



Table XI. 



Hot season. 



For 100,000 grains. 

 Total solid Organic 



River water of 2nth May, 1867, 



Spring tide, Flood, 



Ebb, 

 Ditto of 6th June, spring, Flood, 



General's Tank of 10th June, 

 Dalhousie Sq. Tank of 10th June, 



contents. 



55.60 

 16.45 

 50.75 

 10.74 

 41.35 



matter. 



.90 



.75 

 1.70 

 2.40 

 2.58 



12.07 



10.71 



10 26 



1.22 

 .63 



.71 



1.06 



.74 

 1.10 



Bainy Season. 



River Water of 13th July, purified by 



perchloride of iron, 

 Ditto by ditto in smaller proportion, 

 Ditto settled 3 days and syphoned off, again 



settled 8 days, 

 Ditto settled and sand filtered continuously -\ 



with new water daily till 26th, then > 



settled till 18th August, J 



River Water of 16th August, Flood, 



Ditto of 24th August, Ebb, 



The experiments on the hot season waters were made to decide the 

 question involved in the objection raised to my first results, namely, 

 that the organic matter had been decomposed and lost by the delay 

 (of from ten to fourteen days) in proceeding to the evaporation. 

 In the present cases the water was evaporated on the next day after 

 collection. The result shews only from .90 to 1.70 grains organic 

 matter in 100,000 grains of water taken at flood tide of the highest 

 spring tides of the season ; less indeed than I had obtained in 1866. 

 Many other experiments have shown me that there is very little 

 change in the weight of organic matter sustained by keeping it even 

 for several weeks, and least of all in the case of water containing so 

 much saline matter as the river does at this season. The only thing 

 that undergoes rapid change is the deoxidising power of the water as 

 shewn by the permanganate test, but this does not appreciably affect 

 the weight of the organic matter. 



