6 4 D O C . 7 6 J U L Y 1 9 1 9 from a high negative solar potential? I have not yet been motivated to check this exactly. My wife sends her warmest regards. I wish you much pleasure in Switzerland. As ever, yours truly, A. D. Fokker. 76. From Hendrik A. Lorentz Loenen op de Veluwe, 26 July 1919 Dear Colleague, After returning from Paris and Brussels and reading your letter to de Haas, the main content of which he had relayed to me by telegram, I did not write you imme- diately, because I wanted to wait and see whether something of significance to you might be sent to me during the first weeks. Now that this has not been the case, I would like to say that I have discussed the matter in question confidentially with Messrs. Brillouin, Heger, and Noyons– all were able to understand completely and appreciate the sentiment that leads you and your friends to your planned enterprise. They then pledged to cooperate as well in procuring the desired documentary evidence, fulfillment of which pledge, it seems to me, would be most easily reached if I were able to give fuller particulars on what is being requested. The next letter from you, which you promise in your letter to de Haas, will probably put me in that position. Mr. Noyons showed and told us much about the destruction of Louvain  he has very copious and, it seems to me, conclusive material at his disposal. Naturally, he cannot part with it, and it was unfortunately not possible in the brief period of our visit to make a selection and prepare some transcriptions. Mr. Noyons is willing, however, to go to Holland with his documents and we could arrange it, if you so wish, that you meet with him at my home, either alone or with one or more others. As regards the mood I found among our colleagues in France and Belgium, the general feeling is, as is also natural, a greater or lesser degree of bitterness against Germany whenever this is expressed, the deplorable Manifesto of the 93 always comes to the fore. Nonetheless, they know how to differentiate it is known that there are people like you in Germany who are beyond reproach, and when I found occasion to say something about the good things that have been done by Germans in the last few years and recalled, e.g., how I always found notably Planck ready to stand up for Belgians who were suffering under the oppression, they listened to me without protest.