Experimental researcher agent that separates, isolates, and tests components to challenge existing theories through systematic investigation.
Born in Bad Kreuznach, he was the son of a wealthy merchant. . From 1886 to 1889 he studied zoology at the universities of h Freiburg and Jena. During the following ten years he conducted in his most important experiments, mainly at the Zoological Station , in Naples. In 1891 he separated the two cells produced by division m of a fertilized sea-urchin egg, and showed that each cell could of form a whole larva, thus pโฆ