486 RECORDS 



years ago in obtaining this effect called after his name. It 

 shows itself as a splitting up of the lines of the spectrum into 

 double, triple and more complex lines, when the source of light 

 is placed in a strong magnetic field. The Zeeman effect, to- 

 gether with J. J. Thomson's experiments and speculations, give 

 us the idea of the atom being composed, in part at least, of cor- 

 puscles, one of which, being detached, forms the negative ion of 

 the cathode rays and other phenomena, while the part left be- 

 hind, having a much greater mass, forms the positive ion. In 

 these corpuscles we may have the primeval material from which 

 all other matter is composed. 



The lecturer showed a number of lantern slides of photographs 

 of the Zeeman effect and of the various kinds of apparatus by 

 which it is investigated. 



Wm. S. Day, 



Secrctaiy. 



BUSINESS MEETING. 



May 7, 1900. 



Academy met at 8:15 P. M., Professor William Hallock pre- 

 siding. 



The minutes of the last business meeting were read and ap- 

 proved. 



The Secretary reported from the Council as follows : 



The appointment of Dr. Theodore G. White as Acting Editor. 



The establishment of a series of rules for publication. 



The vote of the Council to secure photographs of past presi- 

 dents of the Academy, to be hung in the Library. 



The vote of the Council to extend their thanks to Professor 

 Kemp for his valuable services as Chairman of the Exhibition. 



The vote of the Council to send the thanks of the Academy 

 to President Morris K. Jesup for his courtesy and kindness in 

 allowing us to use the Museum for the Annual Exhibition, and 

 through President Jesup to the employees of the Museum, for 

 their cordial assistance and p-ood will. 



