Abstract
Fertilized eggs of white leghorn were injected with calcicol and parotin, and observations were made on the general growth and ostosis of the chick embryos was histologically examined.
In the group administered with calcicol, retardation of growth of the embryos was noticed and it became more pronounced as the dosage was increased.
When parotin was jointly given, this retardation of growth caused by calcicol was almost completely prevented. Best results were obtained with parotin dosages of 0.001γ to 0.01 mg.
