To MONSIEUR COSSIGNY; dated 3d YOOSÛFY. (29th December.)

THERE is a book which comes from Europe, and which treats of the barometer,* wherein it is written, that at certain [stated] times the quicksilver rises a certain number of degrees; and that if, at such times, a person afflicted with any one of certain [stated] disorders shall, during a paroxysm of his complaint, place his hand on the barometer, the degree to which the quicksilver may, in consequence, ascend, will indi­cate the state [or height] of such person’s disorder. Get this [book] translated into Persian, and send it to the Presence.