It is a collection of accounts of paranormal phenomena, including apparitions, hauntings, and poltergeists, that were witnessed by the author or reported to him by others.Bolton was a prominent member of the Society for Psychical Research, an organization dedicated to the scientific investigation of paranormal phenomena. In "Ghosts in Solid Form," he presents a variety of cases that he believes provide evidence for the existence of ghosts and other supernatural entities.The book includes stories of ghostly apparitions that were seen by multiple witnesses, as well as cases of objects moving and strange noises being heard without any apparent cause. Bolton also explores the possibility of ghosts taking on physical form, an idea that was controversial even in his time.Despite the book's title, Bolton does not claim to have definitive proof of the existence of ghosts in solid form. Rather, he presents these cases as evidence that warrants further investigation and study."Ghosts in Solid Form" is a fascinating historical document that provides insight into the beliefs and attitudes towards the paranormal in the early 20th century. It remains of interest to those interested in the study of psychical research and the paranormal.