By Jacqueline Corsin

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ALLOWABLE L A T I T U D E T h e latitude allowable in scientific illustration may permit some deviation from absolute precision except in significant details. For example, you might draw the outline of a skull in a free manner, whilc a certain feature of that skull that is being discussed must be rendered in absolute detail. The purpose the illustration is to serve also may determine the latitude permitted. A picture used as an embellishment or to show an animal in general will not be drawn as precisely as an illustration of a particular structure in a particular specimen.

Birds may be kept in the dark until they are nccded for actual dra~ving;usually the sudden light ~ v i l l keep them quiet for a ivhile. Special pens and cages may be built or improvised for irnrnobilizing live animals. Small aquariums and wide-mouthed glass jars covered with hardware cloth can bc used as cagcs. A pane of glass can be placed inside the aquarium to confine thc subject to a smaller area. Generally speaking, thc animal should have enough room to turn around and assume a comfortable position without bcing either cramped or allowed to roam.

T'hc chief advantage in using tracing paper for sketching is that you can draw and retrace a drawing, changing and rearranging lines and details, over and over again until you have produced a satisfactory preliminary sketch. T h e tracing paper may be taped over a printed grid (such as graph paper), to make measuring easier. Sonie artists do all their sketch corrections 011 one piece of tracing paper by flipping the sketch over and altering the lines on the back, then flipping back again, erasing the front and altering again, until the sketch is satisfactory.

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