Since communications will be reproduced by photographing the author's typewritten manuscript, it is essential that the manuscript be prepared properly. Any communication which cannot be directly photographed without revision will be returned to the author so that the required changes can be made. The following specific instructions must be followed. An original copy must be submitted. The typist should ensure clean, even impression of letters.
Electric typewriters are preferred.
All formulas should be typed in or carefully prepared in permanent black ink using drawing instruments. Tables should be typed as part of the text but in such a way as to separate them from the text. Care should be taken that a table does not overlap onto the next page. Photographs should be glossy prints. A typewriter or lettering set should be used for all labels on the figures.