Romanova E. B. RussiaNizhny NovgorodNizhny Novgorod Lobachevsky State University, 23 Gagarina Prosp., Nizhny Novgorod 603950, Russiaromanova@bio.unn.ru Author's articles COMPARATIVE DATA ON THE LEUKOCYTIC BLOOD FORMULA OF VIPERA BERUS AND VIPERA RENARDI