SCIENCE 



A WEEKLY JOURNAL DEVOTED TO THE ADVANCEMENT OF SCIENCE, PUBLISH- 



ING THE OFFICIAL NOTICES AND PROCEEDINGS OF THE AMERICAN 



ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE. 



NEW SERIES. VOLUME XXIV. 



JULT-DECEMBEE, 1906. 



NEW YORK 

 THE MACMILLAN COMPANY ^ ^ , 



1906 /0A6A' 



