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
copyeight, 190:;, bt the science press
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