Art. IX. — Remarks on the Early History of the 

 Brennan Torpedo. 



By Professor Kernot, M.A., CE. 



[See Proceedings.] 



Art. X. — Notes on Some Determinations of Chlorine in 

 the Water of the Yarra. 



By C. R. Blackett, F.C.S. 



[Read August 11, 1887.] 



The opening of the Fisherman's-bend Canal, in accordance 

 with Sir J. Goode's plan, would seem to have caused a great 

 chancre in the character of the water in the Yarra-river. In 

 1884, Mr. Newber}^ made some determinations of the amount 

 of chlorine in the water. The quantity has much increased 

 even on the surface, but at the bottom it is now as fully 

 charged with salt as the water of Hobson's Bay on the 

 surface at low tide, or indeed more so. 



There are several points of interest in considering the 

 differing amounts of chlorine at high and low tide ; it would 

 seem to conclusively prove that the heavy tidal water slowly 

 creeps up at the bottom of the stream, and that the fresh 

 water coming down the river floats more or less upon the 

 surface, unless when there is a vigorous churning-up by the 

 numerous steamers which are constantly during the day 

 moving to and fro. At the time when my samples were 

 taken, the river was unusually still and free from traffic. 



Another point arrests attention, and that is the very rapid 

 way in which the amount of salt decreases as we ascend- the 



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