| Show ff rem ry SEE HOW AN EMBRYO GROWS WITHIN EGG students watch all stages of development visitors to the incubation school at the new york state college of agriculture see how bow an embryo develops in all of the stages of hatching this is made possible by a new method developed by prof alexis I 1 L romanoff of the cornell university experiment station scientists attempted to study the growth of embryos as early as 1750 when observed the germinal disk through a hole bole 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 lets gers was wa S able to study the embryo up to the fifth day clay and occasionally to the e eighth 1 bab day byerly had about the same success in 1920 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 hie egg by removing the shell and membranes the opened egg Is set on an indented glass to hold it upright and Is covered cohered with a sterilized beaker and placed la in the incubator the experimenters found the greatest mortality from 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 |
