PROBLEMS IN BIOLOGY 



THE NEW CELL DOCTRINE 



Your Magnificence! 

 Gentlemen ! 



To his Royal Highness, the Grand Duke of Saxe- Weimar, 

 I wish to express with the highest respect my sincere thanks 

 for the interest which his Royal Highness has shown in the 

 exchange of professors with America. It is a great honor to 

 be the first Harvard professor to come to you, as the official 

 representative of the American academical world. The 

 University of Jena is as famous and as highly esteemed in 

 America as in Germany. When I consider the reputation of 

 the Jena professors I cannot venture to hope that the lectures 

 I am to deliver will attain that degree of perfection to which 

 you are accustomed. Therefore I request you to consider 

 my lectures as an expression of my sense of obligation. Not 

 merely Harvard University, but the whole United States are 

 grateful to you that you have permitted Professor Eucken 

 to come to us as exchange professor. I owe your Ministry of 

 Education special thanks for the invitation sent me to appear 

 here as the guest of your University. 



It is always a difficult task so to present scientific conclu- 

 sions that they shall be comprehensible to the public and, at 

 the same time, keep their precision and their scientific value; 

 but when a branch of science has progressed so far that 



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