It is shown, in a carefully controlled experiment, that fowl leucemia can be readily transmitted from chicken to chicken by injection. Of 25 fowls, 13 were injected intravenously with blood from a chicken (No. 575) with erythroleucosis and 12 with blood from a chicken (No. 689) with myeloid leucosis. The injected birds and an equal number of uninjected controls were kept in tiers of alternating...

In a previous paper (1) we reported the results of a study of the blood chemistry of hens bearing the Rous sarcoma No. 1. In this paper it was shown that there were no changes in the nonprotein nitrogen, uric acid, creatinine, chlorides, cholesterol, serum calcium and inorganic phosphorus, hemoglobin, and bilirubin, of the bloods of sarcoma-bearing hens when compared with the same determination...

For some years antibiotics have been included in the feed of young pigs and poultry to produce faster growth. With this widespread use, it is important to know whether there are any cumulative effects either on the mature treated animals or on successive generations of their progeny. The experiment here described was designed primarily to investigate whether the inclusion of penicillin in the d...