Sir,—"H. M." of the March "Current Notes," p. 20, enquires "the formation of our British Union Jack." To describe it in heraldic terms is as follows: Az. a cross saltire argent encalved gules; over all a common cross, the same as first. I believe there are no given rules as to its proportion. This appears to be the best, viz. the breadth three-fourths of the length. But the inclosed, forwarded to H. M., will suffice for all.[A]