The book "The Mirror of Literature, Entertainment and Instruction. Issue 12, No. 349, Supplement to Volume 12" is an English-language publication that collects various literary works, interesting facts, funny stories and useful advice. In this volume, readers will be able to enjoy a variety of works by different authors. This addition to the twelfth volume is an important addition to the series and offers more interesting material for readers of all ages. The author(s) of this book is a collective of authors under the pseudonym "Various", which adds even more variety and interest to the material presented. "Mirror of literature, entertainment and instructions" will be a wonderful reading pastime and a source of useful information for everyone who is interested in the world of literature and knowledge.