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The Popular Science Monthly

Entered in the Post Office in Lancaster, Pa., as second-class matter.

CONTENTS OF APRIL NUMBER

Our Inland Waterways. Dr. W J MgGee.

Accidental Resemblances among Animals— A Chap- ter in Unnatural History. Professor Bashford Dean.

The History of Science — an Interpretation. Pro- fessor C. R. Mann.

Physics. Professor Ernest Fox Nichols.

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

The Utilization of Auxiliary Entomophagous Insects in the Struggle against Insects Injurious to Agri- culture. Professor Paul Marchal.

The Children's Museum as an Educator. Anna Bil- lings Gallup.

The Progress of Science :

The Carnegie Institution of Washington ; Sir Richard Strachey. The Popularization of Science ; Scientific Items.

CONTENTS OF MAY NUMBER

Some New View Points in Nutrition. Professor Russell H. Chittenden.

The Utilization of Auxiliary Entomophagous Insects in the Struggle against Insects Injurious to Agri- culture. Professor Paul Marchal.

Of the Soil of the Earth. Spencer Trotter.

The Conservation of the Great Marine Vertebrates:— Imminent Destruction of the Wealth of the Seas. Dr. G. R. Wieland.

The Whiter Pittsburgh. John F. Cargill.

The Education of the Colored Race is the Duty of the Nation. Professor Harris Hancock.

Should Psychology Supervise Testimony? Fabrian Franklin.

The Progress of Science :

The Carnegie Foundation for the Advancement of Teaching and the State Universities ; The Vegetation of the Salton Sea ; John Samuel Bud- gett ; Scientific Items.

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