88 Contribution towards the knowledge of snakes in Brazil 
O gr. 000010 and O gr. 000020 wbich are, respectively, the minim 
lethal doses of the L. atrox' and L. jararaca's poison through intra- 
venous channels in pigeons. By intra-muscular channels — the 
minim lethal dose is O gr. 000040 as against O gr. 000500 and 
O gr. 000700 which are, respectively, the minim lethal doses 
of the L. jararaca's and L. atrox” poison by intra-muscular channels 
in pigeons. 
Notable difference are manifest in the neutralizing action which 
the antitoxin exercises on this poison, as a specific serum for 
L. jararaca which with 1 cc. neutralizes O gr. 0026 of the poison 
of this species, can only neutralize O gr. 001 of the Lachesis 
insularis” poison, 
Finally, on making tests on birds I observed that the activity 
of this poison is also very strong, for exemple, O gr. 000010 through 
intra-muscular channels being sufficient to cause the death of 
a «Tico-tico» = Brachyspiza capensis (MULL.). 
OS IC 
