Christie’s auction house on Sunday said it is selling a rare first edition of Charles Darwin’s “On the Origin of Species”.

The book one of around 1,250 copies first printed in 1859 had been on a toilet bookshelf at a family’s home in Oxford.

The book will be auctioned on Tuesday, the 150^th anniversary of the publication of the famous work. Christie’s said the book is likely to sell for 60,000 pounds approximately $99,000.