Abstract
Chorioallantoic membranes of 269 purebred White Leghorn chick embryos, 203 purebred Jungle Fowl-Cornish chick embryos, and 469 chick embryos originating from reciprocal genetic intercrosses were examined for tumors induced by Rous sarcoma virus, using three dilutions of virus. The White Leghorn strain of chick embryo averaged 116.5 tumors per chorioallantoic membrane and showed a highly significant difference ( P < 0.01) from the Jungle Fowl-Cornish strain, with an average of 10.4 tumors. There was no significant difference ( P < 0.05) between the average responses of the two reciprocal crosses, which were of intermediate susceptibility.
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