Show SEE HOW AN EMBRYO GROWS WITHIN EGG students watch all stages of development visitors to the incubation school at the he new york state college ot of agriculture see how no an embryo develops in all or of the stages of hatching this Is made possible by a new method developed by prof alexis L romanoff Roma of the cornell university experiment station scientists attempted to seuay the growth of embryos as early as 1750 when beguelin observed the germinal disk through a hole in the shell at the side or blunt end of the egg the opening was covered with a piece of shell from another egg in 1887 gerlach as able to study the embryo rip to the fifth day and occasionally to td the eighth day byerly had about the sayne same success in MO 1926 at cornell the development of the embryo has been observed from the fresh egg up to the normal hatching the egg Is first washed in alcohol and a hole Is made about an inch in diameter at the blunt end of the agg gg by removing the shell and membranes the opened egg Is set on an indented glass to hold it upright and ts Is covered with a sterilized beaker and placed in the incubator the experimenters found the greatest mortality from tile the second to the fourth day when the heart begins to function eggs opened after one week of incubation had the least mortality and could be watched throughout the hatching process |