"On two planets." by Kurd Laßwitz, Weimar, 1897. The literature is in the public domain. This app contains both volumes of the novel. With this app you can easily read the novel on your smartphone, e.g. through your individual setting of the font size and the display of the last viewed page when you restart the app. For larger fonts, if the page is higher than the display, the page can be moved up using the touch function.