IN MEMORIAM : WILLIAM ACKROYD, F.I.C., F.C.S. 471 
Malham investigations, as in this case the factor was permanent 
tliough there was practically a complete absence of chlorine in 
the rocks from which the headwaters of the Aire derived their 
salts. He read papers before our Society and the Chemical 
Societies in exjjosition of his views of salt circulation, by which 
he showed that the bulk of the salt carried seawards by rivers 
was due to spray carried inland by storms, and therefore was 
no actual addition to the ocean store. In the subsequent 
discussion Mr. Ackroj^d well maintained his position. He 
frequently attended our Council Meetings, and the breadth of 
his scientific interests, as well as his genial personality, rendered 
his presence always welcome. As President of the General 
Meeting held in Leeds, March 2nd, 1905, he took a keen interest 
in the discussion on earth movements which was then initiated. 
In the last letter received from him by the writer, Mr. Ackroyd 
thus expressed a wish to deal with some of the large issues 
raised : — " I have just been looking through the Classified Index 
you compiled in 1903, and see that Cosmical Geology has had 
a place in our Proceedings. When time permits I wiU give a 
paper to the Society on this section of its work. It will fill an 
evening some time when you are short of papers." Xot man}?- 
weeks afterwards came as a severe shock the sad news that in 
one brief hour he had swiftly passed the line that separates our 
present ignorance from the \\ider knowledge and freer activity 
of the spirit -life beyond. 
W.' Lower Carter. 
Amongst the Papers of which he was the author were the 
following : — 
Transverse Absorption of Light {Chem. News, 1877). 
Selective Absorption (Phy. Soc, 1876). 
Researches on Moorland Waters — I., Acidity (Chem. Soc, 
1899). 
Researches on Moorland Waters — II., on the Origin of the 
Combined Chlorine (Chem. Soc, 1901, vol. 79). 
Halifax Waters {Halifax Naturalist, Feb., 1899). 
Lead Poisoning — its Causes and Prevention (York. San. 
Inspec Assoc.). 
