H. A. X. A. (Fulham) asks: (1) "What size should designs be made for reproduction - such as pictorial postcards ? Should they be larger, smaller, or of the same size as they are to be reproduced? (2) What size should designs be for reproduction as magazine covers and advertisements ? (3) May any colours be used for both of the above, and on what surface should they be used?" - The methods to be employed will depend in a great measure on the process by which the designs are to be reproduced. You do not say whether the originals are to be drawn in line; washed in, in monochrome; or painted in oil or water colours. If they are not to be in colours, but only pen and ink drawings, their reproduction will be a very simple and inexpensive matter; it will only be necessary to draw with an ordinary pen and black (not bluish) ink, on smooth white card or bristol-board, making the drawing from a third to twice the height and from a third to twice the width of the desired reproduction. This applies alike to your inquiries about postcards, advertisements and magazine covers. If the originals are washed drawings or oil sketches in monochrome, they may be done in black, brown, or even red - but on no account blue or black with a bluish tinge - and they may be reproduced by the halftone (wire-screen) process, which is two to three times as costly as the direct line process. If drawings or designs in full colour are to be reproduced, the conditions are quite different, entailing much more expense for the publisher, which will vary in degree accordingly as he may choose to use the photographic " three-colour process" or the more costly process of lithography. As its name tells us, the three colour-process calls for three printings only, which are done by means of half-tone blocks - a yellow, a red and a blue - imposed one over the other to represent, so far as may be, the full colourings of the original, which, however, it will only approximate. Lithography should give very nearly a facsimile, but this will require many printings - usually from eight to twelve. Whatever process may he used - simple line block, or half-tone, or "three-colour process," or lithography - it will be advisable to print from six to two dozen different postal card pictures on the same sheet so as to economise in the printing; it would never "pay" to print only two or four postal cauls to a sheet. For reproduction in colours, an original may be of any size, so long as it is not smaller than the desired reproduction, and it may be painted in either oil, water colours, or any other medium.