The purpose of this study was detection of the poison from the acute cyanide and aresenic poisoned rabbits, The author administered KCN and $AS_2O_3$ to rabbits and caused acute poisoning, then analysed the teeth, dental pulp and jaws of the rabbits chemicotoxicologically and observed the specimen histopathologically. 1. In subcutaneausly injected group of KCN, a large amount of cyanide was detected in blood and lung and a small amount of cyanide was detected in teeth and dental pulp, but was not detected in jaws. 2. In orally administered group of KCN a large amount of cyanide was detected in blood, lung and dental pulp and a small amount of cyanide was detected in teeth and jaws. 3. In orally administered group of $AS_2O_3$, arsenic was detected markedly in teeth and jaws, but was detected a little in dental pulp. 4. In orally administered and heat-treated group of KCN, the author could detected cyanide in teeth, dental pulp and jaws. 5. In suvcutanelusly injected group of KCN, orally administered group of KCN and orally dministered group of $AS_2O_3$, histopathologic findings showed the congestion and hemorrhage in dental pulp. 6. In orally administerd group of $AS_2O_3$, the congestion and hemorrhage in buccal mucosa were found and the basal cell degeneration and fibrosis were found in palatal mucosa.