SCIENCE 



Friday, August 11, 1916 



CONTENTS 

 Recent Progress in our Knowledge of the 

 Physiological Action of Atmospheric Con- 

 ditions : Professor Frederic S. Lee 183 



The Origin of the Pre-Columbian Civilization 

 of America: Professor G. Elliot Smith. 190 



The Production of Tungsten 195 



Scientific Notes and News 1 96 



University and Educational News 201 



Discussion and Correspondence: — 

 Mosquitoes and Man: Allan H. Jennings. 

 Goiter among the Indians along the Mis- 

 souri: Dr. Ales Hrdlicka. Compulsory 

 Mathematics — an Explanation: Dr. David 

 Snedden. The Southern Bullfrog: H. A. 

 Allard 201 



Scientific Booles: — ■ 



Thorp's Outlines of Industrial Chemistry: 

 S. P. Sadtler. Eoernes's Urgeschichte der 

 bildenden Kunst in Europa: Professor 

 George Grant MacCurdt 205 



The Mechanism of Light Production in Ani- 

 mals : Professor E. Newton Harvey .... 208 



Special Articles: — 

 On the Association and Possible Identity of 

 Boot-forming and Geotropic Substances of 

 Hormones in Bryophyllum calycinum : Dr. 

 Jacques Loeb 210 



The American Chemical Society: Charles L. 

 Parsons , 211 



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

 review should be sent to Professor J. McKeen Cattell, Ga 

 On-Hudson. N. Y. 



RECENT PROGRESS IN OUR KNOWL- 

 EDGE OF THE PHYSIOLOGICAL 

 ACTION OF ATMOSPHERIC 

 CONDITIONS i 



Two weeks ago to-day, in the physiolog- 

 ical laboratory of the Columbia School of 

 Medicine, Dr. Fred "W. Eastman and I 

 made the following experiment: A young 

 man, twenty-one years of age, in excellent 

 physical condition, who was willing to act 

 as the subject of our tests, was dressed in 

 light underclothing and light trousers, a 

 sweater, stockings and shoes. His systolic 

 and diastolic blood pressures and his pulse 

 rate were taken in the sitting posture; the 

 carbon-dioxide content of the alveolar air 

 of his lungs was determined; a pneumo- 

 graph was attached to his chest for record- 

 ing his respiratory movements ; a resistance 

 thermometer was placed in the rectum and 

 connected with a self-writing galvanometer 

 for the continued record of his bodily tem- 

 perature; and a flat-bulbed thermometer 

 was strapped firmly to his forehead to serve 

 as an indicator of the temperature of his 

 skin. Thus equipped he entered a small 

 chamber, provided with a door and win- 

 dows and with facilities for heating and 

 humidifying the air. He remained there, 

 sitting quietly, for a period of four and one 

 quarter hours. The temperature of the air 

 in the chamber was raised as quickly as 

 possible above the temperature of his body 

 and reached a maximum of 43.3° C. (110° 

 F.) with a maximum wet-bulb reading of 

 37.2° C. (99° P.), while the relative humid- 

 ity was increased to a maximum of 85 per 



i Eead before the American Pediatric Society, 

 "Washington, D. C, May 8, 1916. 



