Once upon a time, in University of Jena, Ernst Haeckel was intrigued of Charles Darwin's book entitled "The Origins of Species" ....
What a wonderful theories Darwin theorized! Now I feel the urge to complete my work!
"....der Organismen" now i'm done! I can now share to the world my ideas and works in a book.
I would like to thank Johann Wolfgang von Goethe from Germany, Jean Baptiste Lamarck from France, and Charles Darwin from England.
Without them, my book would not be completed as of today.
In my book, it states that the biogenetic law depends on three assumptions. The law of correspondence, phylogenesis must occur by the addition to the end of the normal developmental process and lastly, the principle of truncation.
The second assumption states that the early stages of different species' embryos look similar to each other because of developmental constraints present early in development. These constraints disappear towards the end of development, which allow for the addition of new characters and for subsequent evolution.
The law of correspondence states that each stage of development in higher animals, such as humans, corresponds to adult stages of lower animals, such as fish. For instance, gill slits in early human embryos correspond to the gill slits in adult fish.
The third one states the inconsistencies between the stages of animals from different taxa. For instance, pigs and humans may look similar to each other as early embryos, but as ontogeny progresses, the embryos start to look different from one another. If embryos pass through the linear stages of their evolutionary ancestors, then the two embryos should go through the same stages until the pig reaches full development and the human continues through the subsequent stages of its evolutionary ancestry.