What's the difference between alchemy and alchymy?

Alchemy

Definition:

(n.) An imaginary art which aimed to transmute the baser metals into gold, to find the panacea, or universal remedy for diseases, etc. It led the way to modern chemistry.
(n.) A mixed metal composed mainly of brass, formerly used for various utensils; hence, a trumpet.
(n.) Miraculous power of transmuting something common into something precious.

Example Sentences:

(1) The surface channelling effect has been observed in GaAs (110) with REELS, which may provide a basis for localizing surface foreign atoms with ALCHEMI.
(2) Coûteaux, who eventually fell out with both Le Pen and Philippot, described their meeting as pure alchemy.
(3) A drug of longevity, prior to alchemy, was peach, from which the god of longevity has emerged.
(4) But as many coaches have learned before, managing that alchemy within MLS and its rolling state of exception, involves an almost parodic version of standard managerial practices.
(5) They know about alchemy in Aswan, for it is a place that has always shifted from one thing into another.
(6) Johnson, holding the press conference in the Foreign Office, said: “We can spend an awfully long time going over lots of stuff that I’ve written over the last 30 years … All of which, in my view, have been taken out of context, through what alchemy I do not know – somehow misconstrued that it would really take me too long to engage in a full global itinerary of apology to all concerned.
(7) The alchemy is, as we have seen, extraordinarily powerful.
(8) Greek alchemy, the earliest record of which dated about 200 A.D., presents a similar version, was originally Chinese and was introduced by the Arabs who brought herbal drugs of longevity to Alexandria.
(9) With gorgeously savoury ribs, a rib-sticking Italian soup, and a creamy Keralan fish curry on the menu, it was particularly tough to pick a favourite, but for sheer alchemy, James Connery's magically melting ox cheek ragu took some beating.
(10) In China the development of alchemy has been ruled by two theories: first, as like makes like, a perennial plant can make human life perennial: likewise, certain substances can prolong human life as they are rich in Life-force or Soul-content.
(11) This glorious reverse alchemy was at play outside Buckingham Palace today, as Gordon Brown made his historic – and historically uneventful – journey to see Her Majesty.
(12) Jon Moulton, founder, Alchemy Partners "An iceberg is definitely awaiting a victim - one day.
(13) Koolhaas describes the elevator as “the product of technological alchemy: a fusion of several boring existing innovations which had a dramatic impact on the shape of our cities and the shape of our bodies alike”.
(14) "Those plans are being worked through right now – the alchemy of that will be very exciting."
(15) There is another theory that Alchemy arose in China.
(16) The theory generally accepted maintains that Alchemy arose at Alexandria as a child of Greek culture.
(17) Few have pulled off this alchemy quite as effectively as Angelina Jolie and William Hague in their joint campaign for international action against mass rape in conflicts.
(18) And we’ve got more weapons of our own: Solidarity, Wit, the remarkable alchemy that is Nonviolence.
(19) The Radio 1 and BBC Asian Network DJ Nihal has curated the event as part of the centre's Alchemy festival , which celebrates art from the Indian subcontinent.
(20) The Europeans must do more to share their military capabilities – co-operating more effectively rather than cutting across the board or, as he put it, indulging "in some reductionist alchemy which leaves everyone doing less of the same".