"Cut a couple of cards each into a circle of about two inches in diameter; perforate one of these at the centre, and fix it on the top of a tube, say a common quill. Make the other card ever so little concave, and place it over the first, the orifice of the tube being that directly under, and almost in contact with the concave card. Try to blow off the upper card, you will find it impossible. We understand that the cause that counteracts the effect at first expected of this singular phenomenon, has lately puzzled all the members of the Royal Society. A medal and a hundred guineas are said to be the reward of the successful discoverer. Could any of the correspondents of "N. & Q." give any additional information on this rather curious point? ELGINENSIS. _Drying up of the Red Sea._--Will some of your correspondents kindly assist me, by a reference to a passage in one of our modern historians, alluding to the extraordinary drying up of the Red Sea on one occasion? I thought I had read it in Rollin, as a quotation from Baronius, but cannot now find it in either one or the other. W. STILLMAN. Birmingham. _Joan d'Arc._--Did Joan d'Arc (the Maid of Orleans) bear any heraldic insignia; and if so, what? Is the family from which she sprung now represented; and if they bear arms, what are they? Is there any family of this name (D'Arc), and if so, where? And what are the arms belonging to it, if there are any? BEND. _Diary of Thomas Earl._--Strype (_Annals_, vols. i. & ii.) sometimes refers to a MS. No. 206. in the collection of Moore, Bishop of Ely, which he describes as a Diary (vol. i. pp. 135. 180.) kept {207} by Thomas Earl, who was made parson of St. Mildred's, Bread Street, at the beginning of Queen Elizabeth's reign, and "seems to have been a diligent noter of matters of remark concerning religion in his time" (vol. ii. p. 539.). In the _Catal. Libr. MSS. Angl._, part ii. p. 366., it is described-- "Short notes of matters relating to the church by way of annals, written by some that favoured Puritanism, from the year 1548 to 1599." Bishop Moore left his library to the University of Cambridge. Is this MS. in their possession, and is it a piece of historic value? Q. Q. "_Jenny's Bawbee._"--I would be glad if any of the readers of "N. & Q." would inform me where the old Scottish song, "Jenny's Bawbee," is to be found? It begins, "Your plack and my plack, And Jenny's bawbee, We'll put it i' the pint stoup, An' birl't a' three." J. MN. _Lord North._--In Forster's _Life of Goldsmith_, the following remark occurs respecting Lord North, George III.'s premier: "North was the son of the princess dowager's intimate friend Lord Guildford, and scandal had not hesitated to find a reason for the extraordinary resemblance he presented to the king in his clumsy figure, homely face, thick lips, light complexion and hair, bushy eyebrows, and protruding large grey eyes."