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alcohol, acetic acid and a base (lime) being present, nothing 
further is required for the development of the process 
described by the author. 
Professor Roscoe suggested that some of the bodies 
described by the author might possibly be represented as 
substitution products, one or more of the atoms of hydrogen 
of the indigo blue being replaced by one or more organic 
radicles. 
A Paper was also read “ On Some Physiological Effects of 
Carbonic Acid and Ventilation,” Part I., by Dr. R. Angus 
Smith, F.R.S., President. 
