Vol. LXIII. No. 6 W^ SEPTEMBER, 1903 



THE 



POPULAR SCIENCE 

 MONTHLY 



EDITED BY J. McKEEJf CATTELL 



CONTKNXS 



Palm and Sole Impressions and their Use for Purposes of Personal 



Identification : Professor Harris Hawthorne Wilder .... 385 

 Some of the Extra-artistic Elements of Esthetic Emotion. John 



Cotton Dana 411 



Karl Lamprecht und Kulturgeschichte. Professor Wm. E. Dodd . . . 418 



Pulse and Rhythm. Mary Hallock 425 



Theories of Sleep. Dr. Percy G. Stiles . . " 432 



Hertzian Wave Wireless Telegraphy. Dr. J. A. Fleming 439 



Mosquitoes and Suggestions for their Extermination. William Lyman 



Underwood 454 



Shorter Articles and Discussion: 



The Ascending Obelisk of the Montague Pel^e : Professor Angelo Heilprin. Pro- 

 fessor Shaler on Animal Intelligence ; Dr. Eug. L. Fisk 466 



Scientific Literature: 



The Collected Papers of Rowland and FitzGerald 470 



The Progress of Science : 



John Ericsson : The Massachusetts Institute of Technology ; Summer Laboratories 

 and Schools ; Sceintifio Items 475 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON, N. Y. 



NEW YORK : Sub-Station 84 

 Single Numbee, 30 Cents Teaely Sdbsceiption, $3.00 



COPYEIQHT, 1903, BY THE SCIENCB PRESS 



