In 1846 Joseph Leidy discovered that the worm trichina is found in this animal
... Leidy was also a renowned parasitologist, and determined as early 
as 1846 that... [DOC] [TLE] joseph leidy - National Academy of Sciences [PAR] whole animal world from the protozoa to man, rendering in ... ancestry of Joseph 
Leidy we find, both on the father's and ....