In this edition the missing part of one letter and eighteen entirely new ones are presented. The search for these letters even extended to Japan. Therefore, all new Smith letter discovered since 1977 are included. In addition, wherever errors were suspected or misreadings have come to light in the standing text as a result of advice from reviewers and correspondents, these have been corrected.

In this edition the missing part of one letter and eighteen entirely new ones are presented. The search for these letters even extended to Japan. Therefore, all new Smith letter discovered since 1977 are included. In addition, wherever errors were suspected or misreadings have come to light in the standing text as a result of advice from reviewers and correspondents, these have been corrected.