A work like this one hangs in an immense web of dependencies that cannot be done justice by a brief acknowledgments page. Such a project would be inconceivable were it not for the efforts of scholars and scientists dating back to the era of Wilkins and Comenius, and extending into the present day. Not to say as much would be unjust. But in a work of fiction, which necessarily strays from historical and scientific truth, acknowledgments can backfire. Serious scholars mentioned below should be applauded for their good work, never blamed for my tawdry divagations.