The method of embryonic grafting has proved of considerable value. Murphy (1913), Danchakoff (1916), and others have extended the method to the chick, by utilising the chorio-allantois of other embryos as host-tissue for the grafted pieces.
In the following pages some account is given of experiments designed especially to test the capacity for differentiation of whole portions of the body of early chick embryos. Some other experiments with organ-rudiments are also recorded.
The methods used were essentially those of previous investigators. 6- to 12-day embryos were used as hosts, the most frequent age being 7 to 9 days. The eggs were “candled “and the position of the embryo marked. The shell was swabbed with 90 per cent, alcohol over the site of operation. A triangular cut was made in the shell a short distance away from the position of the embryo. The cut was made with a small...
