2o6 Proceedings. 



Ordinary Meeting, April 4th, 1893. 



James Bottomley, B.A., D.Sc, F.C.S., Vice-President, 

 in the Chair. 



The thanks of the members were voted to the donors of 

 the books upon the table. 



Reference was made to the death of Mr. J. S. Crowther, 

 elected a member in 1849. 



It being the Easter holiday period the attendance was 

 very small, and after a conversation on some peculiarities of 

 human vision, the meeting was dissolved. 



The substance of the following note (received April 6th, 

 1893), "On the Suspended Impurities in Manchester 

 Water," by Mr. WiLLlAM THOMSON, F.R.S.Ed., was 

 brought before the Society at the meeting on December 

 13th, 1892 : — 



" No attempt, so far as I know, has been made to deter- 

 mine the quantity of suspended impurities in Manchester 

 water, for the reason that little or none of these impurities 

 will settle, and the ordinary methods of separating them by 

 filtration through filter paper is impossible ; first, because 

 much of the suspended matter would pass freely through 

 the paper at the beginning of the filtration, and secondly 

 because the pores of the filter paper would soon become 

 blocked up, so that no water would pass through it at all. The 

 quantity of suspended matter in Manchester water is very 



