Question: Who published the prequel to Sphereland?

Related documents: [0]  [DOC] Sphereland: A Fantasy About Curved Spaces and an Expanding Universe is a 1965 novel by Dionys Burger, and is a sequel to "Flatland", a novel by "A Square" (a pen name of Edwin Abbott Abbott). The novel expands upon the social and mathematical foundations on which "Flatland" is based. It is markedly different from the first novel in that it has a more prosaic ending and treatment of society. [END] 
[1]  [DOC] Flatland: A Romance of Many Dimensions is a satirical novella by the English schoolmaster Edwin Abbott Abbott, first published in 1884 by Seeley & Co. of London. [END]  
Answer: Seeley & Co.
Seeley & Co.