Leicester, and the reputed Poisoners of his Time

At page 315. vol. ii. of D'Israeli's *Amenities of Literature*, London, 1840, is as follows:— "We find strange persons in the Earl's household (Leicester). Salvador, the Italian chemist, a confidential counsellor, supposed to have departed from this world with many secrets, succeeded by Dr. Julio, who risked the promotion. We are told of the lady who had lost her hair and her nails," ... "of the Cardinal Chatillon, who, after being closeted with the Queen, returning to France, never got beyond Canterbury; of the sending a casuist with a case of conscience to Walsingham, to satisfy that statesm…