458 



SCIENCE 



[N. S. Vol. LIV. No. 1402 



sistent with proper conditions for health. In 

 this connection the use of ozone has fre- 

 quently been proposed and actually tried in a 

 number of places. The ozone is supposed to 

 deodorize and purify the air by the oxidation 

 of organic matter and possibly by killing 

 bacteria. 



It is, however, a question as to whether 

 ozone can be introduced in quantities large 

 enough to kill bacteria without producing very 

 serious irritation of the throat and lung tis- 

 sues. It is also a question as to whether 

 harmful oxides of nitrogen are not produced 

 simultaneously with ozone. Definite informa- 

 tion is needed on this subject. The first step 

 in obtaining such information is to work out 

 methods for accurately determining the per- 

 . centage of ozone and oxides of nitrogen pro- 

 duced for different types of ozone machines 

 and to develop suitable methods for determin- 

 ing the very small quantities of ozone and 

 oxides of nitrogen that may be present in air 

 treated with such machines. Analytical work 

 of the highest precision is required. The gas 

 laboratory of the Bureau of Mines Pittsburgh 

 Experiment Station is now engaged on this 

 problem, working in cooperation with the Re- 

 search Bureau of the American Society of 

 Heating and Ventilating Engineers which is 

 housed in the same building. 



After the chemists have worked out the 

 methods of detecting and analysing these 

 small quantities of ozone and oxides of nitro- 

 gen, the next problem will be undertaken in a 

 like cooperation of the two agencies just 

 named working with the United States Public 

 Health Service. Surgeons from this service 

 are detailed to the Bureau of Mines for work- 

 ing on health and sanitation problems. The 

 work is being carried on under the joint gen- 

 eral direction of A. C. Fieldner, supervising 

 chemist and superintendent of the Pittsburgh 

 Station of the Bureau of Mines, and Dr. E. 

 E. Sayers, chief surgeon of the Bureau of 

 Mines, by G. W. Jones, assistant gas chemist, 

 W. P. Yant, assistant analytical chemist, and 

 O. W. Armspach, engineer of the American 

 Society of Heating and Ventilating Engi- 

 neers. 



THE PUEBLO BONITO EXPEDITION OF THE 

 NATIONAL GEOGRAPHIC SOCIETY 



Neil M. Judd, curator of American arche- 

 ology in the U. S. National Museum, has 

 returned to Washington from New Mexico 

 where he has been engaged, during the past 

 five months, as director of the National Ge- 

 ographic Society's Pueblo Bonito Expedition. 

 This first summer's explorations in Pueblo 

 Bonito — one of the largest and best preserved 

 prehistoric ruins in the United States — is re- 

 ported to have been entirely successful and 

 to have prepared the way for more intensive 

 research next season. Over forty dwellings 

 and five large ceremonial rooms were ex- 

 cavated; a considerable collection of artifacts 

 and much valuable data were recovered. 



As a unique feature of the National Ge- 

 ographic Society's newest expedition it is pro- 

 posed to hold an annual symposium at Pueblo 

 Bonito — a conference to which will be invited 

 leaders in various branches of science. The 

 first of these meetings, held late in August, 

 was attended by several archeologists and ag- 

 riculturists; geologists, botanists and soil ex- 

 perts will be invited to the next conference. 

 Through the willing cooperation of these spe- 

 cialists, each expert in his own branch of 

 science, it is hoped to gain a deeper under- 

 standing of the conditions under which the 

 ancient inhabitants of Pueblo Bonito carried 

 on their numerous activities ; i.e., the geophys- 

 ical conditions which obtained in their day, 

 the source and extent of their water supply, 

 their methods of agriculture, the character 

 and variety of their foodstuffs, as well as an 

 index as to their cultural attainments, through 

 careful examination of the archeological data 

 recovered. This is the first instance, it is be- 

 lieved, in which American men of widely 

 differing fields of science have joined in solu- 

 tion of a common problem. 



THE STEELE CHEMICAL LABORATORY OF 

 DARTMOUTH COLLEGE 



At the dedication of the Steele Chemical 

 Laboratory, according to the account in the 

 Boston Transcript, the assembly included Gov- 

 ernor Albert A. Brown of New Hampshire, 

 former Governor Pingree of Vermont, Dean 



