A diamond ring said by a faithful courtier to have brought him health and strength when he was at death’s door, was one sent by King James I to Thomas Sackvil, Duke of Dorset, High Treasurer both under Elizabeth and James. When, early in June, 1607, news was brought the king that his Treasurer was so dangerously ill that his life was despaired of, he sent him a rich gold ring set with twenty diamonds, five of which were so disposed as to form a cross. With the ring James sent a special message, expressing the hope that Sackvil would recover and might live as long as the diamond in the ring endured. This proof of his sovereign’s favor called the patient back to life, according to his own narration.[580] Convulsions and fits were believed to be cured by rings made of a silver coin representing the value of a number of smaller pieces of money, sixpences or even pennies, collected at the church door from those who had just been present at a communion service. Should this have taken place on Easter Sunday, the value and efficacy of the talismanic ring made from the offering were much enhanced. A less religious source for a silver ring of this kind has been reported. Five bachelors were to contribute a sixpence apiece, and a bachelor was then to convey the silver to a blacksmith who was also unmarried and who was to make the ring. An absolute requisite, however, was that none of the voluntary contributors should have the slightest idea of the destination of his sixpence.[581] For the cure of ulcers, Johannes Agricola advises the wearing of rings made from solidified quicksilver, during a conjunction of the moon with the planet Mercury; these rings were to be worn on the side opposite to that afflicted with the ulcer.[582] This might suggest some vague idea of the fact that the right hemisphere of the brain controls the left side of the body, and _vice versa_, although if the effect of the ring was to be transmitted by reflex action of the brain, the stimulus must of course, proceed from the afflicted side. It is said that if a remedial potion were stirred about with the ring finger, the heart would quickly realize the presence of poison, and would thus give warning against drinking it; the fourth finger was therefore sometimes called the “medical finger.”[583]