xciv PROCEEDINGS OF THE CENTENARY MEETING. 



's Rijks Museum van Natuurlijke Historie. 



Leiden, 17 February, 1912. 



The Rijks Museum van Natuurlijke Historie received with the greatest 

 interest the most important information by your Secretary, that your Academy 

 will have completed in March, 1912, one hundred years of active devotion to the 

 cultivation of the Natural Sciences, that for the adequate celebration of its 

 Centenary Anniversary, the Academy will call in convention at its Hall the learned 

 men and institutions of the world its collaborators, and finally that the Academy 

 invites the Rijks Museum van Natuurlijke Historie to be represented at this 

 event which will take place at Philadelphia on Tuesday, Wednesday, and Thurs- 

 day, the nineteenth, twentieth, and twenty-first of March, nineteen hundred and 

 twelve. 



Now the high scientific rank occupied by your Academy is plain to all students 

 of Nature and we all are impressed by the amount of scientific work done and 

 provided by its members, so pray to accept of the officers of the Rijks Museum 

 van Natuurlijke Historie at Leiden the most hearty congratulations on the great 

 event, and their best wishes for the prosperity of your adult but not old institution! 



May in the year 2012 the then living generation state the great fact that 

 your Academy still is flourishing and in the very strong condition" that it is now 

 in March, 1912. 



It is with the greatest regret that we can not come over to follow the kind 

 invitation with which you honored us; our sincere congratulations may represent 

 us at your Centenary Festival! 



Vivat, floreat, crescatque Academia Scientiarum Naturalium Philadelphiensis! 



F. A. Jentink, 

 Directeur van 's Rijks Museum van Natuurlijke Historie. 



To the Academy of Natural Sciences of Philadelphia. 



