508 



SCIENCE. 



[N. S. Vol. III. No. 66. 



Henry F. Osborn, who was Chairman of 

 the Committee of Arrangements. An in- 

 novation was introduced this year in hav- 

 ing an address on recent scientific discov- 

 ery and the large lecture room of the 

 Museum was thronged hy people eager to 

 hear Prof. M. I. Pupin, of Columbia Univer- 

 sity, give an experimental demonstration of 

 Eontgen photography. Prof. J. J. Steven- 

 son, the President, also delivered an ad- 

 dress stating the object and aims of the 

 New York Academy of Sciences. 



Among the many exhibits there were a 

 number of unusual interest, as an eflfort had 

 been made to include in the exhibition only 

 objects illustrating recent discoveries or re- 



in the Astronomical section, which was 

 under the direction of Prof. Harold Jacoby? 

 there was exhibited a series of photographs 

 lately made at the Harvard College Observ- 

 atory. Prof J. E. Keeler, of the Allegheny 

 Observatory, contributed a series of photo- 

 graphs of planetary spectra. Prof. J. K. 

 Rees exhibited some lantern slides and new 

 instruments from the Columbia University 

 Observatory. Prof. William Hallock, of 

 the section of Physics, had collected in his 

 exhibit a number of instruments and pho- 

 tographs connected with X-ray investiga- 

 tions. Several from Prof. Rood's laboratory 

 showing the reflection of the rays and other 

 phenomena ; a series from Prof. Eobb, of 

 Trinity College, the most interesting of 

 which was a record of the test of genuine 

 and imitation gems, the real stones in each 

 case appearing translucent ; and a set from 

 from Prof. Stevens, of Troy Polytechnic In- 

 stitute, attracted considerable attention. 

 Prof. Hallock 's voice analysis apparatus 

 was also shown and was accompanied by a 

 number of photographs of vocal cords in 

 action and the manometric flames.' Prof. 

 Pupin, the Chairman of the section of Elec- 

 tricity, exhibited a complete set of appa- 

 ratus for producing the Eontgen rays, and 



by means of an Edison iluoroscope the pen- 

 etration of the rays was shown. Prof. 

 Pupin exhibited also a number of photo- 

 graphs he had taken and the apparatus 

 he had devised for studying long electric 

 waves. Charles T. Eittenhouse showed ap- 

 paratus for studying the magnetic lay in 

 closed magnetic circuits. 



In the department of Chemistry the prep- 

 eration of Argon and Helium was shown 

 and the spectra of these two elements could 

 be seen through spectroscopes. Under 

 Photograph}^ the development of process 

 work in colors and new apparatus occupied 

 considerable space, while here also were to 

 be found more Eontgen photographs, that 

 of a boot and foot by Nikola Tesla being 

 remarkablj' distinct. In the section of 

 Geology Prof. Stevenson exhibited some in- 

 teresting specimens, while Prof. J. F. Kemp 

 showed specimens connected with recent 

 researches by himself and his assistants at 

 Columbia University. In the division de- 

 voted to Mineralogy, under the direction of 

 E. O. Hovy, were exhibited some rare speci- 

 mens contributed by a number of collectors 

 and colleges. The phosphorescence of the 

 diamond was shown by George F. Kunz, by 

 means of a new apparatus. In the depart- 

 ment of Physiography the most recent maps 

 and models were exhibited in the charge of 

 Prof. R. E. Dodge. The feature of the 

 Botanical Exhibit was the topographical 

 map of the New York Botanical Garden, 

 which was exhibited for the first time. A 

 number of preparations and studies were 

 also shown, several of which were under- 

 taken in the interest of the Revision Com- 

 mittee of the United States Pharmacopseia. 

 The Torrey Botanical Club exhibited a 

 series of valuable studies. This section 

 was in charge of Prof. H. H. Eusby and Dr. 

 J. K. Small. An interesting exhibit of 

 aquaria was made in the Zoological section 

 and preparations from the zoological de- 

 partment of Columbia University were 



