CONTENTS 



I. SCIENCE AT THE BEGINNING OF THE CENTURY ... 1 



II. THE CENTURY'S PROGRESS IN ASTRONOMY 44 



III THE CENTURY'S PROGRESS IN PALEONTOLOGY .... 88 



IV. THE CENTURY'S PROGRESS IN GEOLOGY 123 



V. THE CENTURY'S PROGRESS IN METEOROLOGY .... 157 

 VI. THS CENTURY'S PROGRESS IN PHYSICS. THE "IMPON- 

 DERABLES" 192 



VII. THE ETHEII AND PONDERABLE MATTER 230 



VIII. THE CENTURY'S PROGRESS IN CHEMISTRY 252 



IX. THE CENTURY'S PROGRESS IN BIOLOGY. THEORIES OP 



ORGANIC EVOLUTION 288 



X. THE CENTURY'S PROGRESS IN ANATOMY AND PHYSI- 

 OLOGY ... 321 



XL THE CENTURY'S PROGRESS IN SCIENTIFIC MKDICINE . 354 

 XII. THE CENTURY'S PROGRESS IN EXPERIMENTAL PSYCHOL- 

 OGY 395 



XIII. SOME UNSOLVED SCIENTIFIC PROBLEMS 433 



i. SOLAR AND TELLURIC PROBLEMS 435 



n. PHYSICAL PROBLEMS 443 



m. LIFE PROBLEMS 449 



INDEX ...... ,459 



