THE SEMI-CENTENNIAL ANNIVERSARY 55 



SECOND DAY 



Smithsonian Institution, Washington, D. C. 



Wednesday, April 23, 1913. 



The meeting was called to order by President Renisen at 

 10: 40 o'clock a. m. 



The President: I regret to have to announce that Professor 

 Boveri is ill and will be unable to give the promised lecture. 



The next speaker is the distinguished astronomer of Holland, 

 Dr. J. C. Kapteyn, who is Director of the Astronomical Lab- 

 oratory. I was told that, unless I stopped there for a moment 

 and emphasized that word, it would be assumed that I had made 

 a mistake or that somebody else had made a mistake; but that is 

 the name of the institution over which Dr. Kapteyn presides. 

 It is not an astronomical observatory. Those two names seem to 

 flow together by a natural process; but it is an astronomical lab- 

 oratory, where work proper to a laboratory is carried on, and 

 where work proper to an astronomical observatory can not be 

 carried on. 



I have pleasure in presenting to you Dr. Kapteyn, Director of 

 the Astronomical Laboratory of the University of Groningen, 

 who will speak to you on " The Structure of the Universe." Dr. 

 Kapteyn. (Applause.) 



