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[Illustration]






LECTURES ON VENTILATION:

  BEING A COURSE DELIVERED IN THE FRANKLIN INSTITUTE, OF PHILADELPHIA,
  DURING THE WINTER OF 1866-67.


BY LEWIS W. LEEDS,

    Special Agent of the Quartermaster-General, for the Ventilation
    of Government Hospitals during the War; and Consulting Engineer
    of Ventilation and Heating for the U. S. Treasury Department.


=Man's own breath is his greatest enemy.=


  NEW YORK:
  JOHN WILEY & SON, PUBLISHERS,
  2 Clinton Hall, Astor Place.
  1869.



  Entered according to Act of Congress, in the year 1868, by
  LEWIS W. LEEDS,
  In the Clerk's Office of the District Court of the United
  States for the Southern District of New York.


  New York Printing Company,
  81, 83, _and_ 85 _Centre Street_,
  New York.




PREFACE.


These Lectures were not originally written with any view to their
publication; but as they were afterwards requested for publication in the
Journal of the Franklin Institute, and there attracted very favorable
notice, I believed the rapidly increasing interest in the subject of
ventilation would enable the publishers to sell a sufficient number
to pay the expense of their publication; and, if so, that this very
spirit of inquiry which would lead to the perusal of even so small a
work, might be one step forward towards that much-needed more general
education on this important subject.

It