Identifier: cu31924089940419 (find matches)
Title: The history of creation; or, The development of the earth and its inhabitants by the action of natural causes. A popular exposition of the doctrine of evolution in general, and of that of Darwin, Goethe, and Lamarck in particular
Year: 1876 (1870s)
Authors: Haeckel, Ernst Heinrich Philipp August, 1834-1919 Lankester, E. Ray (Edwin Ray), Sir, 1847-1929 Haeckel, Ernst Heinrich Philipp August, 1834-1919. Natürliche schopfungsgeschichte English
Subjects: Evolution Heredity Human beings
Publisher: New York, D. Appleton and company
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
ression inthe pedigree of the animal kingdom. For the true causeof the intimate agreement in structure can only be theactual blood relationship. Hence we may, without furtherdiscussion, lay down the important proposition that allanimals belonging to one and the same circle or type mustbe descended from one and the same original primary form.In other words, the idea of the circle or type, as it isemployed in zoology since Bar and Cuviers time todesignate the few principal main groups or sub-kingdoms of the animal kingdoms, coincides with the idea of tribe or phylum, as employed by the Theory of Descent. If, then, we can trace all the varieties of animal forms tothese seven fundamental forms, the following question nextpresents itself to us as a second phylogenetic problem—Wliere do these seven animal tribes come from ? Are theyseven original primary forms of an entu-ely independentorigin, or are they also distantly related by blood to oneanother ? TJaueckel-Histary ofCreatUm,. FL.Vl.
Text Appearing After Image:
m- INFERENCES FROM ONTOGENy. 123 At first we might be inclined to answer tliis question in apolyphyletic sense, by saying that we must assume, for eachof the seven great animal tribes, at least one independentprimary form completely distinct from the others. Onfurther considering this difficult problem, we arrive in theend at the notion of a monophyletic origin of the aidmalkingdom, viz., that these seven primary forms are connectedat their lowest roots, and that they are derived from a single,common primaeval form. In the animal as well as in thevegetable kingdom, when closely and accurately considered,tJis m,onophyletic hypothesis of descent is found to be 7)%oresatisfactory than the polyphyletic hypothesis. It is comparative ontogeny (embryology) which first andforemost leads to the assumption of the monophyletic origin ofthe whole animal kingdom (the Protista excepted of course).The zoologist who has thoughtfully compared the history ofthe individual development of various animals

Note About Images