I must beg leave to differ most decidedly with MR. G. T. HOARE on this point. If it is in accordance with the principles of perspective that, supposing the eye and the picture in their true positions in relation to each other and to the objects represented, every line drawn from the eye to any point of a real object will pass through its corresponding point in the picture, then the supposed wall will form the base of a pyramid, of which the eye will be the apex, and the representation of the wall in the picture a section parallel to the base, and consequently mathematically similar to the base itself. It is perfectly true, as MR. HOARE says, "that every line above or below the line of the horizon, though _really_ parallel to it, _apparently_ approaches it, as it is produced to the right or left." But he forgets that this fact applies to the picture as well as to the object. In fact, the picture is an object, and the parallel lines in it representing the wall must have the same apparent tendency to one another as those in the wall itself. [Greek: Halieus] Dublin. I am glad MR. G. T. HOARE has called attention to the defective state of the art of perspective. His remarks, however, are too narrow. The fact is, that _any_ two parallel straight lines appear to converge at one or both ends, _and one or both lines assume a curvilinear shape_. For a notable example, the vertical section of the Duke of York's column in Waterloo Place, from all points of view, appears to bulge at the point of sight, and to taper upwards by a curvilinear convergence of the sides. C. MANSFIELD INGLEBY. * * * * * LORD FAIRFAX. (Vol. ix., p. 10.) The following is all the information which I have been able to collect respecting the present possessor of the title of Fairfax of Cameron, in answer to the third Query of W. H. M. It gives me pleasure to communicate it. The Lords Fairfax have been for several generations natives of the United States. The present possessor of the title is not so called, but is known as _Mr._ Fairfax. He resides at present in Suter County, California. His Christian names are George William. The gentleman who bore the title at the commencement of the present century, was a zealous member of the republican (now called democratic) party. The Fairfax family, at one time, owned all that portion of Virginia called the Northern Neck, lying between the Potomac and Rappahannock rivers. So much for the _third_ Query. I beg leave to add a few remarks suggested by the _fifth_.