_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._
October 1: 9.45 a. m., 4 cc, 2 per cent caffein (163 mg per kilo),
injected into peritoneal cavity; 4.30 p. m., no symptoms developed
since injection.
October 3: 2 p. m., alive.
October 8: Found dead. _Autopsy_: Congestion of lungs, spleen, liver,
kidneys, and small intestines.