EDISON PHONOGRAPH OF 1878 65 WHITNEY'S COTTON GIN 65 DE WITT CLINTON TRAIN OF 1831 BESIDE A MODERN LOCOMOTIVE 80 LOCOMOTIVE OF THE 1870 PERIOD 81 "JOHN BULL," A LOCOMOTIVE BROUGHT FROM ENGLAND IN 1831 81 WEATHER AND ASTRONOMICAL INSTRUMENTS ON THE ROOF OF GREENWICH OBSERVATORY, ENGLAND 112 MOORING TOWER FOR AIRSHIPS, WITH THE "R-24" FASTENED HEAD ON 113 HOSPITAL ROOM IN WHICH INFECTED ARTICLES ARE STERILIZED 160 MODERN OPERATING ROOM IN PARIS, FITTED WITH A GLASS DOME AND RADIO MICROPHONES FOR OBSERVING STUDENTS AND DOCTORS 161 EDOUARD BELIN AND THE TELAUTOGRAPH, WHICH TRANSMITS PICTURES BY WIRE 176 LEE DE FOREST, INVENTOR OF THE OSCILLATING AUDION 177 AUTOMOBILE WITH RADIO EQUIPMENT FOR LISTENING IN EN TOUR 177 GIFTS FOR TUTANKHAMEN BROUGHT BY ONE OF HIS VICEROYS 192 TUTANKHAMEN'S TOMB--BRINGING UP THE HATHOR COUCH 193 QUEEN NEFERTITI, MOTHER-IN-LAW OF TUTANKHAMEN AND WIFE OF AHKNATON 193 HOW TO USE THE POPULAR SCIENCE LIBRARY This series of books is written for all the people and not for specialists only, though it is the work of specialists who know how to explain their subjects clearly and interestingly, without unnecessary technicalities and with keen appreciation of the popular and constantly increasing desire for scientific knowledge. The supreme importance of science in the wonderful age in which our lot has been cast was demonstrated with overwhelming force of conviction by the events of the World War. If, as certain persons assert, science may be accused of having rendered war more destructive and terrible, yet, on the other hand, no one can deny that it was science that saved the world from sliding backward into an age of despotism. The true importance of science for everybody arises from its rapidly increasing service in the development of human industry in all its forms, for industry is the mother of democracy. Said Gabriel Lippman, the French physicist, inventor of color photography, who died in the summer of 1921: "For thousands of years science progressed by groping and feeling its way, and coincidentally industry got slowly on by guesswork; but within the last century science has developed more than during all preceding time, while industry has sprung upon its feet and begun to march with the strides of a giant."