Established by Edward L. Youmans

APPLETONS'
POPULAR SCIENCE
MONTHLY

EDITED BY

WILLIAM JAY YOUMANS

VOL. LVI

NOVEMBER, 1899, TO APRIL, 1900

NEW YORK
D. APPLETON AND COMPANY

1900

EDWARD ORTON.

CONTENTS

	PAGE
THE TRANSPLANTATION OF A RACE.	[513]
MODERN CITY ROADWAYS.	[524]
TYPICAL CRIMINALS.	[539]
A CENTURY OF GEOLOGY.	[546]
"SALAMANDERS" AND "SALAMANDER" CATS.	[556]
WHAT MAKES THE TROLLEY CAR GO.	[564]
A SURVIVAL OF MEDIÆVAL CREDULITY.	[577]
"RIBBON LIGHTNING."	[587]
CROSS-EDUCATION.	[589]
THE MORBID "SENSE OF INJURY."	[596]
EARLY EXPERIMENTS IN AIR FLIGHT.	[603]
SKETCH OF EDWARD ORTON.	[607]
EDITOR'S TABLE.	[614]
FRAGMENTS OF SCIENCE.	[618]
MINOR PARAGRAPHS.	[622]
PUBLICATIONS RECEIVED.	[624]

APPLETONS'
POPULAR SCIENCE
MONTHLY.

MARCH, 1900.

APPLETONS'POPULAR SCIENCEMONTHLY