Proceedings. 193 



2. Snow taken from the field near* Clap Gate, neutral, 

 contained 4/3 grains of sooty deposit. 



Snow taken from Whitworth Park, February 7th, 

 tested acid, contained 16 grains of sooty deposit, dust, 

 and cotton fibre. 



Snow from Alexandra Park, neutral, and contained 6*5 

 grains of sooty deposit, also cotton fibre. Examining these 

 deposits with the microscope, the sooty dust looked like 

 pieces of coke and coal mixed, also pieces of sand and 

 lime. 



The samples taken from the hedge-side drift on the 

 19th February showed that the longer exposure had 

 considerably increased the quantity of deposit, all 

 tested neutral, and contained as an average 37-31 

 grains of deposit in 2,000 grains of snow. This deposit 

 on being calcined lost 47-5 of its weight, showing 

 that nearly half of it was carbon ; the residuum after 

 burning was a red ash, principally iron and silica, but it 

 also contained copper. The filtrate was evaporated to 

 dryness and this was also found to contain copper; so that 

 copper had been deposited on the snow in an insoluble and 

 soluble condition. The percentage of copper in these 

 samples was : — 



Insoluble, found in residuum '00937 



Soluble, found in nitrate 00046 



Total copper '00983 



Very similar results were obtained in January, 1893. 

 Cotton fibre was found in the deposits at Whitworth and 

 Alexandra Parks, and copper in the samples collected at 

 Widnes. The Whitworth Park snow was, as on that 

 occasion, acid; that found at Widnes, alkaline. In January, 

 1870, Sir Henry Roscoe, Mr. Alfred Fletcher (now chief 

 Alkali Inspector), and Mr. J. Fenwick Allen collected two 

 sets ' of snow samples in the neighbourhood of St. Helens. 

 The snow had been lying some days, the winds had been 



