They appear to have a page on Jenner (http://www.uni-marburg.de/fb09/hma/jenner).
Google translation of the page (http://66.102.9.104/translate_c?hl=en&sl=de&u=http://www.uni-marburg.de/fb09/hma/jenner&prev=/search%3Fq%3Dhttp://www.uni-marburg.de/fb09/hma/jenner%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26hs%3Dlrn%26sa%3DG) (and having a nose around in the inventory) seems to indicate that they do in fact have a copy of this, and also that the originals are in the Staatsarchiv Marburg. Getting somewhere now...
no subject
Google translation of the page (http://66.102.9.104/translate_c?hl=en&sl=de&u=http://www.uni-marburg.de/fb09/hma/jenner&prev=/search%3Fq%3Dhttp://www.uni-marburg.de/fb09/hma/jenner%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26hs%3Dlrn%26sa%3DG) (and having a nose around in the inventory) seems to indicate that they do in fact have a copy of this, and also that the originals are in the Staatsarchiv Marburg. Getting somewhere now...
:) Thank you!