A MEDICINE WHICH I CALL IMPROVED ESSENCE OF MUSTARD
Year: 1798

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ROBERT
JOHNSTON, of Greak Street,-in the Parish of Saint Ann's, Soho, in the County
of Middlesex, Chymist and Apothecary, send greeting.
WHEREAS His most Excellent Majesty King George the Third did, by
His Letters Patent under the Great Seal of Great Britain, bearing date at
Westminster, the Thirtieth day of March, in the thirty-eighth year of His reign,
give and grant unto me, the said Robert Johnston, His especial licence that
I, the said Robert Johnston, during the term of years therein mentioned, should
and lawfully might use, exercise, and vend, within England, Wales, and
the Town of Berwick-upon-Tweed, my Invention of "A MEDICINE WHICH I CALL
IMPROVED ESSENCE OF MUSTARD;" in which said Letters Patent there is contained
a proviso, obliging me, the said Robert Johnston, by an instrument in writing
under my hand and seal, to cause a particular description of the nature of my
said Invention, and in what manner the same is to be prepared, to be inrolled
in His Majesty's High Court of Chancery within one calendar month after
the date of the said recited Letters Patent, as in and by the same (relation
being thereunto had) may more fully and at large appear.
NOW KNOW YE, that in conipliance with the said proviso, I, the said
Robert Johnston, do hereby declare that my said Invention is described in
manner following (that is to say) :-
-
Take the whole plant and root of the white and brown mustard, and the
white and brown mustard seed, any quantity, and with a sufficient quantity of
water distil therefrom the essential oil; put this essential oil, with an equal

page_text: quantity of essential oil of juniper, and the purest alkohol, into a retort, and
with as gentle a heat as possible draw it over, and keep it very closely stopped;
digest cloves in fresh quantities of pure alkolol so long as they afford any
flavour, filter it, put it into a cucurbit, and distil off the spirit till it begins to
thicken; to this residuum add a proper quantity of distill'd water, and it will
præcipitate; divide this præcipitate into flat cakes, and dry it with a gentle heat;
digest gum guaiacum in the purest alkohol, filter it, distill off a part of the
spirit till it begins to thicken, precipitate with water, and dry it in the same
manner. Take of the above preparation of cloves, Ibi. 33; the preparation of
guaiacum, b237; balsam of pern, bi. 35; balsam of tolu, i. 39; intimately
mix the whole together, and stiffen it so as to form a hard mass with Russia
castor powder'd, with which castor three drams of the above essence of mustard
is to be mixed to each pound of this mass; six drams of genuine kermes mineral is
to be added, and then formed into pills. Take brown mustard seed, 15 36, pour
thereon 40 gallons of essential oil of turpentine boiling hot, let it stand till cold, and
then put it all into the still with a sufficient quantity of water and draw
39 gallo:; to this add 2 animal oil or oil of hartshorn (rectified by repeated
distillations in retort till divested both of colour and smell), 50 camphor, Ib 4
essential oil of rosemary, 3 4 essential oil of cloves, b 3 English oil of lavender,
and six drams of the above essence of mustard.
In witness whereof, I, the said Robert Johnston, have hereunto set my
hand and seal, this Twenty-seventh day of April, in the year of our Lord
Inrolled the Twenty-eighth day of April, in the year above written.