How to pronounce “haller” in English

Haller-- he's on the left-- was one of the most impressive polymaths of his day.

Haller and Wolff each made careful, very detailed studies of the chick embryo.

But Haller argued that within the fluids there actually were structures, but they were transparent, and therefore invisible to the human eye.

So when Haller looked at chick eggs, he observed that, for the first few days after fertilization, the contents of an egg appear to be entirely liquid,

But where Haller saw the work of God, Wolff saw simple mechanical, physical, and chemical processes.

To convince Haller to try and reconsider epigenesis, Wolff sent him a copy of his doctoral thesis, which was a huge mistake.

When he was young, Haller had studied in the Netherlands, and he learned about preformation theory and accepted it as true.

And this irritable force, Haller said, was bestowed upon matter by God.

To add some credibility to his new theory, Haller began to observe the development of chick eggs.

But although Trembley's polyps piqued his interest in epigenesis, Haller couldn't really accept the theory.

Now, he made almost identical observations on chick eggs to Haller's, but he interpreted his results very differently.