136 Proceedings of the Royal Society 
velocity with which the air is permitted to pass through the house. 
This velocity is necessarily regulated by the numbers present, 
the temperature to which the air can be reduced in warm weather, 
and the amount of moisture which it may contain when the quan- 
tity is excessive. Some members are much more affected by an 
excess or deficiency of moisture than by alterations of temperature. 
In extremely warm weather, by increasing the velocity, air even at 
75° may be rendered cool and pleasant to the feelings.” 
He goes on to say — “ The temperature may always be advan- 
tageously increased and the velocity diminished before the usual 
dinner hour. After dinner, other circumstances being the same, 
the temperature should be diminished, the velocity increased, and 
the amount of moisture in the air reduced. During late debates, 
as they advance to two, three, four, or five in the morning, the tem- 
perature should be gradually increased as the constitution becomes 
more exhausted, except in cases where the excitement is extreme.” 
Next to the Houses of Parliament, Dr Keid’s greatest and most 
successful undertaking of ventilation was the St George’s Hall at 
Liverpool, in which immense building, on some occasions, there have 
been as many as 4500 persons for about ten hours ; the air during 
all that time having been supplied to all that multitude in a pure 
state, and in a comfortable and agreeable condition as to tempera- 
ture and moisture. 
Dr Keid superintended while in this country the arrangements 
for ventilating the royal yacht, “The Victoria and Albert,” and 
the steamships used in the expedition to the Niger, in both in- 
stances to the entire satisfaction of his employers ; and since going 
to America, he was employed in the ventilation of a Kussian frigate, 
“ The Grand Admiral,” built at New York 
Arthur Connell, eldest son of Sir John Connell, Judge of 
the Admiralty Court, and author of a well known work on the 
Law of Scotland respecting Tithes, entered the High School of 
Edinburgh in 1804, and the University of Edinburgh in 1808, 
where he studied under Playfair, Leslie, Dugald Stewart, and Hope. 
From Edinburgh Mr Connell went to Glasgow College, where he 
studied under Jardine and Young, and, having obtained a Snell 
exhibition, went to Balliol College, Oxford, in 1812. 
