In the opinion of Detective Sergeant Douglas, Chalmers was poisoned by some obscure chemical. He has sent specimens of the strange blue slime found on Chalmers' body to the Partridgeville Chemical Laboratories; and he expects the report will shed new light on one of the most mysterious crimes of recent years. That Chalmers entertained a guest on the evening preceding the earthquake is certain, for his neighbor distinctly heard a low murmur of conversation in the former's room as he passed it on his way to the stairs. Suspicion points strongly to this unknown visitor and the police are diligently endeavoring to discover his identity.