SCIENCE 



A WEEKLY JOURNAL DEVOTED TO THE ADVANCEMENT OF SCIENCE, PUBLISHING THE 



OFFICIAL NOTICES AND PROCEEDINGS OF THE AMERICAN ASSOCIATION 



FOR THE ADVANCEMENT OF SCIENCE. 



Editorial Committee : S. Newcomb, Mathematics ; E. S. Woodward, Mechanics ; E. C. Pickering, 

 Astronomy ; T. C- Mendenhall, Physics ; R. H. Thurston, Engineering ; Ira Remsen, Chemistry ; 

 Charles D. Walcott, Geology ; W. M. Davis, Physiography ; Henry F. Osborn, Paleon- 

 tology ; W. K. Brooks, C. Hart Meeriam, Zoology ; S. H. Scudder, Entomology ; C. E. 

 Bessey, N. L. Britton, Botany ; C. S. Minot, Embryology, Histology ; H. P. Bow- 

 DiTCH, Physiology ; J. S. Billings, Hygiene ; William H. Welch, Pathol- 

 ogy ; J. McKeen Cattell, Psychology ; J. W. Powell, Anthropology. 



Friday, August 1, 1902. 



CONTENTS: 



The American Assooiation for the Advance- 

 ment of Science: — 



The Prevention of the Pollution of Streams 

 61/ Modern Methods of Seicage Treat- 

 ment: Peofessob Leonard P. Kinni- 



CUTT 161 



Physics at the Pittsburgh Meeting: Pro- 

 fessor E. F. Nichols 171 



The Society for the Promotion of Engineering 

 Education : Professor Henry S. Jacoby . . 183 



Association of Economic Entomologists : Pro- 

 fessor A. L. Quaintance 188 



Scientific Books: — 



Savage's Ophtlialmic Myology: Dr. Alex- 

 ander Duane 188 



Societies and Academies: — 



The Teacas Academy of Science: Professor 

 Frederic W. Simonds 190 



Discussion and Correspondence : — 



Iridescent Clouds: E. Waite Elder. Pear 

 Blight in California: Newton B. Pierce.. 192 



The Arc of Quito : I. W 194 



A Fossil Man from Kansas: Professor S. W. 

 Williston 195 



Paleontology at the American Museum of 

 Natural History 196 



Scientific Notes and News 197 



University and Educational Neivs 200 



MSS. intended for publication and books, etc., intended 

 for review sliould be sent to ttie responsible editor, Pro- 

 fessor J. McKeen Cattell, Garrison-on-Hudson, N. Y. 



THE PREVENTION OF THE POLLUTION OF 



STREAMS BY MODERN METHODS OF 



SEWAGE TREATMENT.* 



Mr. President, Ladies and Gentlemen: 



When the Council of the American Asso- 

 ciation for the Advancement of Science 

 first asked me to address you on the sub- 

 ject of modern methods of sewage disposal, 

 I felt that it was not a subject of sufficient 

 general interest, and it was only after se- 

 rious consideration and many misgivings 

 that I consented to do so. 



The pollution of streams by the dis- 

 charge of crude sewage has, however, 

 now reached such a point in the more 

 thickly settled portions of our country, that 

 public attention has at last been called to 

 the subject, and veiy many of our inland 

 cities are now finding themselves face to 

 face with the problem : How can sewage be 

 treated so that it can be emptied into a 

 stream without causing offense? Such 

 being the case, it may not after all be out of 

 place at a meeting of an Association for 

 the Advancement of Science, to consider 

 very briefly what science has done and is 

 doing towards solution of the problem. 



Sewage can be defined as the water 

 supply of a city after it has been used. It 

 contains the solid and liquid excreta of the 



* Complimentary address to the citizens of 

 Pittsburgh. American Association for the Ad- 

 vancement of Science, Pittsburgh Meeting, .June 

 28 to July 3, 1902. 



