Statistics for occurrence #1 of “Heidelberg” in chapter 2, page 28 of Elizabeth Cary Agassiz, Louis Agassiz: his life and correspondence, third edition:

...
various works on physiology, anatomy, and zoology. . . . Next to Alexander Braun, Agassiz's most congenial companion at Heidelberg was Karl Schimper, a friend of Braun, and like him a young botanist of brilliant promise. The three soon became inseparable. Agassiz had many friends and companions at the university beside those...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Heidelberg (Baden-Wurttemberg, Germany) 301 88 1 0 0 user votes
Heidelberg (Canada) 0 0 0 0 0 user votes
Heidelberg (Kentucky, United States) 0 0 0 0 0 user votes
Heidelberg (Minnesota, United States) 0 0 0 0 0 user votes
Heidelberg (Mississippi, United States) 0 0 0 0 0 user votes
Heidelberg (Pennsylvania, United States) 0 0 0 0 0 user votes
Heidelberg (South Africa) 0 0 0 0 0 user votes
Heidelberg (South Africa) 0 0 0 0 0 user votes
Heidelberg (Texas, United States) 0 0 0 0 0 user votes
Heidelberg (Victoria, Australia) 0 0 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.