Kammerer had been an acquaintance and a deep admirer of Gustav Mahler. The 1 original item is a condolence letter written upon the death of Gustav Mahler, in which Kammerer offers Alma Mahler his friendship. The remaining letters (transcripts made by Alma) represent a selection of what, according to Alma's annotation, were about 100 letters that Kammerer wrote to her; his letters often contain responses and polemics related to their relationship and in-person exchanges; some of the other topics which arise include: his decision to donate income from his writings in 1912 to Alma's Gustav Mahler fund (Mahler-Stiftung); his current writing, involving concepts of seriality; his text "Allgemeine Lebenslehre für Mädchenlyzeen," which was apparently being considered by the ministry for education (Unterrichtsministerium) for use in schools but was ultimately rejected; contact he had with the youth movement (Jugendbewegung), giving lessons in biology; the publication of Peter Altenberg's book Fechsung, a collection of prose sketches which included satirical allusions to Alma; his newly found engagement with the work of Anton Wildgans, connected with a visit to Mönichkirchen; and his being found fit for military service in June of 1915. The transcripts end with a typed narrative annotation by (or dictated by) Alma, describing her relationship with Kammerer and her impressions of him, written after 1926 (since it also comments on his suicide).