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PROCEEDINGS

OF

THE AMERICAN ASSOCIATION

FOR THE

ADVANCEMENT OF SCIENCE,

THIRTY-FOURTH MEETING,

HELD AT

ANN ARBOR, MICH.,

AUGUST, 1885.

SALEM:

PUBLISHED BY THE PERMANENT SECRETARY.

1886.

EDITED BY

FREDERICK W. PUTNAM, Permanent Secretary.

PRINTED AT

THE SALEM PRESS,

SALEM, MASS.

TABLE OF CONTENTS.

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On the flexure of transit instruments. By WM. HARKNESS

Description of a printing chronograph. By G. W. HOUGH

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