ILLUSTRATIONS 



THE CURTISS HYDROAEROPLANE Frontispiece 



A SPIRAL NEBULA Facing p. 8 



"NETWORK" NEBULA " 20 



PROFESSOR SVANTE ARRHENIUS IN His STUDY .... " 26 



THE GROUP OF THE PLEIADES OR "LITTLE DIPPER" . " 56 



PROFESSOR JACQUES LOEB IN His LABORATORY ... " 144 



PROFESSOR G. H. F. NUTTALL " 158 



PROFESSOR WILLIAM PATTEN WORKING WITH FOSSIL 



OSTRACODERMS 176 



ANTI-TYPHOID INOCULATION " 210 



PROFESSOR PAUL EHRLICH IN His LABORATORY ... " 222 

 DRAWING BLOOD FROM THE VEIN OF A HORSE TO SECURE 



DIPHTHERIA ANTITOXIN ' ; 228 



TRAPPING THE TYPHOID FLY . . " 250 



Two VIEWS OF THE SPERRY SHIP-STABILIZING GYROSCOPE ' ' 270 

 UPPER FIGURE: THE FARMAN HYDROAEROPLANE; LOWER 



FIGURE: A FRENCH FLYING-BOAT " 302 



FRENCH HYDROAEROPLANES OF MONOPLANE AND BIPLANE 



TYPES " 304 



ANESTHESIA AND ASEPTIC SURGERY " 324 



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