Add to ORKGLetters submitted for possible publication must be identified as such and submitted with a signed trans-fer-of-copyright form (see Information for Readers and Authors in this issue for location of form). Text length must not exceed 400 words. No more than live references may be used; reference format must be that specified in "Information for Readers and Authors" (page 1-9). All parts of letters must be typed double-spaced, including references. Letters not typed double-spaced will not be considered for publication. Tables and figures will not be published. Acceptance of letters for publication depends on several factors: newness of information, relevance to current topics and recent content of this journal, clarity of statement, ...