Blackwood was nudging forty when he made his name with the 1908 short story collection John Silence - Physician Extraordinary. He lived for another forty-three years, became a voice on radio and a skeletal face on early TV, but the first decade of the Twentieth Century was his most productive.
The original five stories from Physician Extraordinary are all here in the original order, plus "A Victim of Higher Space" which may have been written alongside the others but which wasn't published until Day and Night Stories in 1917. One thing should be stressed, these are not short stories. They are all around 40 pages save for 'The Camp of the Dog' which is nearly 60. This is important because the long form allows Blackwood to build his horror in layers. Nothing in itself is especially shocking but the cumulative mass really gets into the reader's psyche.
The book is a curiosity, but it is essential for anyone interested in that singular period between roughly 1890 and 1914 when occultism and ritual magic were actually fashionable.