Sophia Elizabeth De Morgan (1809-1892) was the wife of the mathematician and logician Augustus De Morgan and mother of the celebrated ceramicist William De Morgan. In this book, published in 1863, De Morgan, writing as 'CD' - with a preface by her husband signed as 'AB' - acknowledges that alleged spirit manifestations have faced much criticism and scepticism, but argues that it was a little-understood phenomenon that merited further investigation...