Vol. LXXII. No. 4. APRIL, 1908

THE

POPULAR SCIENCE MONTHLY.

EDITED BY J. McKEEN CATTELL CONTENTS

Our Inland Waterways. Dr. W J McGeb 289

Accidental Kesemblances among Animals — A Chapter in Unnatural His- tory. Professor Bashford Dean 304

The History of Science — An Interpretation. Professor C. R. Mann . 313

Physics. Professor Ernest Fox Nichols 323

The Respiration of an Inland Lake. Professor E. A. Birge ... . 337

The Utilization of Auxiliary Entomophagous Insects in the Struggle against Insects Injurious to Agriculture. Professor Paul Marchal . 352

The Children's Museum as an Educator. Anna Billings Gallup . . 371

The Progress of Science :

The Carnegie Institution of Washington ; Sir Kichard Strachey, The Popularization

of Science ; Scientific Items 380

THE SCIENCE PRESS

LANCASTER, PA. GARRISON, N. Y.

NEW YORK: Sub-Station 84 Single Numbeb, 30 Cents Yearly Subscription, $3.00

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