The paper studies and summarises the linguistic materials on Tabari found in I. N. Berezin's "Recherches sur les dialectes persans". This book was the first attempt in Iranian dialectology, but due to the inaccuracies and incoherent transcription it has largely been ignored since its publication in 1953. Tabari, one of the Iranian languages studied in the book, has more than three million speakers in the Persian province of Mazandaran on the southern shores of the Caspian Sea. It sheds light on certain grammatical characteristics of Tabari not so clearly stated in other contemporaneous sources. From materials documented by Berezin, 24 sentences and a glossary (including a separate list of verbs) are extracted and listed in the article.