XIV PREFACE. 



My thanks also are due to Professor Gralle of Breslau, Dr. 

 Luther of Bilk, Herr Reich of Freiberg, W. Weber of Grottingen, 

 Herr Wild of St. Petersburg, and Dr.Focke of Bremen, from 

 whom I have received various letters addressed either to them 

 or to their scientific friends. 



From General Count von Helmersen of St. Petersburg, from 

 Herr Paschen of Schwerin, and others, I have received various 

 communications concerning Humboldt's scientific labours. I 

 am indebted to Herr Hermann of Cologne for 16 letters 

 addressed by Humboldt while a student at Grottingen to his 

 fellow-collegian Wegener ; while I have been furnished with a 

 series of 61 letters addressed to Eisenstein, the mathematician, 

 by the committee organised for the erection of a memorial to 

 Humboldt at Berlin. 



I have also been so fortunate as to obtain possession of all 

 the papers belonging to Humboldt which at the time of his 

 death fell into the hands of his confidential attendant, Herr 

 Seifert. These consisted of 500 letters of recent date, most of 

 them written within ten years of his death, from royal per- 

 sonages, statesmen, men of science, and artists, besides various 

 sketches of maps and many original treatises, poems, &c., that 

 were presentations to Humboldt. I am also indebted to Herr 

 Seifert for the communication of several orders in Council, the 

 loan of some private letters an^an insight into some of the 

 details of his domestic history. 



In addition to the foregoing I may also mention that I have 

 received various letters and other documents from Herr Fried- 

 lander of Berlin, from Herr von Hermann of Munich, from 

 Herr von Carnall, from Professor Eudolph Wagner of Grottingen, 

 from Dr. Henry Lange of Berlin, from Romer of Lothein, near 

 Meissen, from Herr von Locher, from Herr Lehfeldt, from 

 Frau Groldschmidt nee, Kunth, from Fraiilein Schwenken of 

 Langendeinbach, and others. 



From the Superintendents of the Royal Archives of Berlin I 

 received permission to inspect the public records containing any 

 reference to Humboldt, and I am indebted to them for much 



