“A Simple Procedure for the Long-Term Cultivation of Chicken Embryos”, 1974-12 (; similar):
A method is described which permits the growth of chicken embryos in petri dishes from the 3rd to the 20th day of incubation.
The procedure is relatively simple and has the advantage of providing ready access to the embryo and its membranes for tissue grafting, for introduction of teratogenic agents, and for microscopic observation of morphogenesis and growth.
…we found it essential to develop methods that would permit rapid and ready observation of large numbers of eggs under conditions facilitating examination with transmitted light, permitting time-lapse photography, and encouraging routine access to the grafted tissue. The procedures we describe in this report have now been used by us for growing several thousand eggs during the past several months…