ILLUSTRATIONS 



A RACING AUTOMOBILE Facing page 166 



RETROSPECT AND PROSPECT IN TRANSPORTATION 



THE DE WITT CLINTON TRAIN AND THE GYROCAR . 



TWO VIEWS OP MR. LOUIS BRENNAN'S MONORAIL GYRO- 

 CAR 



AN INTERNATIONAL BALLOON RACE 



TWO FAMOUS FRENCH WAR BALLOONS 



THE ZEPPELIN DIRIGIBLE BALLOON 



AN ENGLISH DIRIGIBLE BALLOON 



ENGLISH AND AMERICAN DIRIGIBLE WAR BALLOONS 

 AND A WRIGHT AEROPLANE 



THE AEROPLANE OF M. SANTOS-DUMONT 



LEARNING HOW TO FLY 



FLYING MACHINES OF THE MONOPLANE TYPE . . . 



THE WRIGHT AEROPLANE 



MR. WILBUR WRIGHT PREPARING TO ASCEND IN HIS 

 AEROPLANE WITH HIS PUPIL M. CASSANDIER . . 



THE FARMAN AEROPLANE 



THE MONOPLANES OF BL^RIOT AND LATHAM . . . . 



A BRITISH AEROPLANE 



MR. WILBUR WRIGHT FLYING OVER NEW YORK HAR- 

 BOR, OCTOBER 4, 1909 



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