1. Anavenoms and their use in the preparation of antivenomous sera; polyvalent anti-Bitis arietans-Naia flava serum and specific Antivenenes against African viperine and colubrine venoms.

2. Blacksnake, or BLACK RACER, a common colubrine serpent (Zamenis constrictor) found in eastern North America from southern Canada to Florida and west to the prairie regions of the United States.The typical eastern Blacksnake is uniform lustrous black above and slate-color beneath, the lower jaw, chin and sometimes upper edges of the lip-plates white, the tongue black.

3. A final point of interest is the fact that Antivenenes of a comparable cross potency, as far as colubrine venoms are concerned, may be produced on the one hand by the use of unmodified venoms and on the other by employing only formalized anavenoms ; this furnishes further evidence of the practical utility of the rapid method of producing