Among the causes of nervous affection and diseased imagination, are those of sedentary habits and a free use of strong tea. The following instances were communicated by my friend the Rev. Mr K. The late Rev. Mr F. of Ipswich, who was very sedentary; spent most of his time in his study without exercise, and his health became impaired. He imagined for some time before his death, that he was actually dead. I saw him in this state of mind, walking his chamber in extreme agitation. To the question, how he could suffer so much, if actually dead, he answered, that his own spirit was departed, and that another spirit had taken possession of his body. A gentleman in Boston once told the first President Adams, that he had become strangely timid, that he dared not keep the side walks, but walked in the middle of the street, being constantly apprehensive that the tile on the houses would fall on his head. The president asked him if he made a free use of tea, and being answered in the affirmative, he recommended to him to use it more sparingly and he would probably be benefited by the change. By pursuing this advice, he was relieved, and was soon able to return to the side walks without fear. A gentleman of Salem, sailing from the south to Massachusetts, while under the influence of nervous affection, imagined that he saw a man in the water near the ship, who was drowning. Conceiving that he might save his life, he was in the very act of leaping into the sea for that purpose, but was happily prevented by those on deck. He afterward recovered his health, and had a perfect recollection of his feelings on that occasion. He had no idea of destroying himself, but would have perished had he not been prevented. Instances of a similar nature have probably occurred, in which lives have been lost in consequence of such delusion. It is said that Mr Murdock, the member of the Vermont Legislature, who recently committed suicide, imagined himself to be Dr Cleaveland, who was under sentence of death. Mr Murdock attempted to speak when Cleaveland's case was before the legislature, but was so much agitated that he could not speak, and was taken from the house by his friends. Under this strong impression of his being Cleaveland, he killed himself to avoid the doom of the law. This event would make a thrilling chapter in Sir Walter Scott's history of Demonology and Witchcraft.