Two days after Rex’s death Ada and Mrs. Greene are poisoned within twelve hours of each other⁠—Ada with morphine, Mrs. Greene with strychnine. + 

Ada is treated at once, and recovers. + 

Von Blon is seen leaving the house just before Ada swallows the poison. + 

Ada is discovered by Sproot as a result of Sibella’s dog catching his teeth in the bell-cord. + 

The morphine was taken in the bouillon which Ada habitually drank in the mornings. + 

Ada states that no one visited her in her room after the nurse had called her to come and drink the bouillon; but that she went to Julia’s room to get a shawl, leaving the bouillon unguarded for several moments. + 

Neither Ada nor the nurse remembers having seen Sibella’s dog in the hall before the poisoned bouillon was taken. + 

Mrs. Greene is found dead of strychnine-poisoning the morning after Ada swallowed the morphine. + 

The strychnine could have been administered only after 11 p.m. the previous night. + 

The nurse was in her room on the third floor between 11 and 11:30 p.m. + 

Von Blon was calling on Sibella that night, but Sibella says he left her at 10:45. + 

The strychnine was administered in a dose of citrocarbonate, which, presumably, Mrs. Greene would not have taken without assistance. + 

Sibella decides to visit a girl chum in Atlantic City, and leaves New York on the afternoon train. + 