April 1: 3.30 p. m., 2 cc 2 per cent caffein (138 mg per kilo) injected into peritoneal cavity; 5.35 p. m., symptoms present; reflexes much increased, but no tetanus. Survived.
Series B.
Guinea pig 51. Yellow female. Weight, 415 grams.
October 1: 9.50 a. m., 3 cc (144 mg per kilo) 2 per cent caffein injected into peritoneal cavity; 4.30 p. m., no symptoms, although under observation all day.
October 3: 2 p. m., alive.
Guinea pig 52. White male. Weight, 450 grams.
October 1: 9.45 a. m., 3.5 cc, 2 per cent caffein (155 mg per kilo), injected into peritoneal cavity; 4.30 p. m., no symptoms developed since injection.
October 3: 2 p. m., alive.
Guinea pig 58. Brown and white male. Weight, 490 grams.