Although Haeckel's ideas are important to the history of evolutionary theory, and he was a competent invertebrate anatomist most famous for his work on radiolaria, many speculative concepts that he championed are now considered incorrect.

Haeckel's work and the ensuing controversy linked the fields of developmental biology and comparative anatomy into comparative embryology.

Although Charles Darwin accepted Haeckel's support for natural selection, he was tentative in using Haeckel's ideas in his writings ; with regard to embryology, Darwin relied far more on von Baer's work.

Müller's work relies specifically on theoretical assumptions that are very similar to Haeckel's and reflects the German practice to maintain strong connections between empirical research and the philosophical framework of science.

Copepods, from Ernst Haeckel's 1904 work Artforms of Nature | Kunstformen der Natur

Decapods, from Ernst Haeckel's 1904 work Artforms of Nature | Kunstformen der Natur

Forrest and Gross noted that Haeckel's, " a conservative Christian youth ," work was "' fudged ', as biologist Massimo Pigliucci says, not ' faked '.

This was in contradiction to Ernst Haeckel's theory that the complete phylogeny of a species would be repeated during embryonic development, including generation of the first nucleated cell from a " Monerula ", a structureless mass of primordial mucus (" Urschleim ").

Some mark Haeckel's definition as the beginning ; others say it was Eugenius Warming with the writing of Oecology of Plants: An Introduction to the Study of Plant Communities ( 1895 ), or Carl Linnaeus ' principles on the economy of nature that matured in the early 18th century.

One of Haeckel's earliest proponents was Carl Gegenbaur at the University of Jena ( 1865 – 1873 ), during which both men were absorbing the impact of Darwin's theory.

During the late 19th century, Ernst Haeckel's recapitulation theory, or " biogenetic fundamental law ", was widely accepted.

At that time comparative embryology was the keystone of morphological evolutionary studies, based on Haeckel's recapitulation theory, the idea that an organism during its embryonic development passes through the major stages of the evolutionary past of its species.

It was first based on Ernst Haeckel's assumption that the earliest animals derived from ciliate protozoans.

Ernst Haeckel's Darwinismus was even more universal, incorporating life, mind, society, politics and knowledge itself, though Darwin had struggled with reading his book and his efforts to get it translated were thwarted as the book proved too controversial.

An impressed Huxley adopted Haeckel's approach, and did what he had told Darwin was impossible and wrong, drawing up a genealogical tree for the ancestry of partridges and pigeons which traced them back to the dinosaurs.

R. Bender ultimately goes so far as to reject His's claims regarding the fabrication of certain stages of development in Haeckel's drawings, arguing that Haeckel's embryo drawings are faithful representations of real stages of embryonic development in comparison to published embryos.

* Haeckel's Anthropogeny ( Leipzig, 1874, 1903 ; Paris, 1877 ; Eng.

Even though Haeckel's program in comparative embryology virtually collapsed after the First World War, his embryo drawings have often been reproduced and redrawn with increased precision and accuracy in works that have kept the study of comparative embryology alive.

Steiner affirms Darwin's and Haeckel's evolutionary perspectives but extends this beyond its materialistic consequences ; he sees human consciousness, indeed, all human culture, as a product of natural evolution that transcends itself.

After On the Origin of Species, the idea of " lower animals " representing earlier stages in evolution lingered, as demonstrated in Ernst Haeckel's figure of the human pedigree.

From a more modern perspective, Haeckel's drawings were the beginnings of the field of evolutionary developmental biology ( evo-devo ).

Romanes ' 1892 copy of Ernst Haeckel's allegedly fraudulent embryo drawings ( this version of the figure is often attributed incorrectly to Haeckel ).

Romanes's 1892 copy of Ernst Haeckel's controversial embryo drawings ( this version of the figure is often attributed incorrectly to Haeckel ).

A variety of ammonite forms, from Ernst Haeckel's 1904 Kunstformen der Natur ( Art Forms of Nature ).

( Photographic plate | Plate from Ernst Haeckel's Kunstformen der Natur ).

The best antidote for the bitterness and disappointment that poisoned him was hard work.

So simple, in fact, that it might even work -- although Pamela, now, in her new frame of mind, was careful not to pretend too much assurance.

He'd started a fire and put coffee on, and now was busy at the work board of his chuck wagon.

Tom Horn was soon back at work, giving his secret employers their money's worth.

The arrangement I had with him was to work four hours a day.

I quit work at my usual hour as if this day was no different from other days.

Their work was lonely.

With Ramey it was a dusty work shoe that was half-off the Indian's foot that he would always remember.

He was aware of her as a frightfully good-looking American WAC, a second lieutenant assigned to do the paper work, ( regardless of how important she might have thought she was ) in the Command offices, but that was all.

That should do it, he thought, because Miss Langford had said she was going to be strict about school work.

The only drawback now to the plan he'd decided on was that someone else might fail to do his work, too, and the teacher would have that person stay late along with Jack.

Was it supposed, perchance, that A & M ( vocational training, that is ) was quite sufficient for the immigrant class which flooded that part of the New England world in the post-Civil War period, the immigrants having been brought in from Southern Europe, to work in the mills, to make up for the labor shortage caused by migration to the West??

His next major work, completed in 1892, was a long fantastic epic in prose, entitled Hans Alienus, which Professor Book describes as a monument on the grave of his carefree and indolent youth.

Whether in prose or poetry, all of Heidenstam's later work was concerned with Sweden.

But his own work was evolving further.

One evening, while a volley-ball game was being played in the yard among the prisoners remaining there, a simulated melee was staged -- just as the gates were opened to admit other prisoners returning from work.

While convalescing in his Virginia home he wrote a book recording his prison experiences and escape, entitled: They Shall Not Have Me Published originally in ( Helion's ) English by Dutton & Co. of New York, in 1943, the book was received by the press as a work of astonishing literary power and one of the most realistic accounts of World War 2, from the French side.

And I was to go to work on that odd matter.

It was part of Little Jack's work to look after the dogs.

As a result, he was sent to a hospital in Arizona until his health improved enough for him to come back to Washington to work in the Government service.

But again, there was danger that his lungs would suffer in the muggy Washington weather, and he had to return to the dry climate of the West to live and work.